US 2172771: ". 2 1 7 2 7 7 1 Sept. 129 1939. R. F. NORRIS VENTILATING SYSTEM Filed Feb. 4, 1936 (OCR)"



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Patent Title: . 2 1 7 2 7 7 1 Sept. 129 1939. R. F. NORRIS VENTILATING SYSTEM Filed Feb. 4, 1936 (OCR)
Patent Number: 2172771 Filing Date: Jan 01, 0001
Application Number: Issue Date: Sep 12, 1939
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Description

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. 2 1 7 2 7 7 1 Sept. 129 1939. R. F. NORRIS VENTILATING SYSTEM Filed Feb. 4, 1936 4 Sheots-Sheet I OD INVENTOR Na @oo@ BY A-rTORNFY.5


2 17 2, 77 1 12, 1939. R. F. NORRIS VENTILATING SYSTEM Filed Fi b. 4, 1936 4 She6ts-She6t 2 119 20 *e 'fo 47 .9 INVENTOR BY y ATTORNEYS


Sept. 120 1939. R. F. NORRIS 2,1729771 VENTILATINCT SYSTEM Filed Feb. 4, 1936 4 She6ts-Sheet 3 -f5, 3-9 ,fs 460 6 2 ;57 r- ,f8 Ifs 161? go 62 61 INVENTOR ,c BY 63.1 )t4O4lfL"' v f@l. "..4 ATTORNEYS


'Sept. 12, 1939. R. F. NORRIS 2,172,771 VENTILATING SYSTEM Filed Feb. 4, 1936 4 Sheets-Sheet 4@ 7- ,67 167 .. ................ ........................... 71 71 72 72 7 0 .77 ZVI @i -, .......... - ------ ---------- 0 I'll TB:2 8 0 841 -a3 sa & 9/ 7 8b 95- 93 94( 93. 7 91? -92 -96 93 INVENTOR BY ATTORNEYS


Patente,d Sept. IZ 1939 2pl72f771 UN . ITED STATES PATENT OFFICE 2,17 ,771 VZN MATING SYSTEM Ralph Forbwh Norris, 1'4adison, Wis., anigner,' by nieme sedgnmenta, to Burcess Battery Company, Chimco, IOL, a corporation of Wisconsin AppHesUon February 4, 1936, SerW No. 62,301 19 Cl,'-s. This Invention relates to Improvements In ventilating systems for rooms and enclosures of all kinds, including ofllces, stores. restaurants, churches, auditoriums, schools, airplane cabins, railway cars, rooms of dwelungs, etc. It Is an object of the Invention to provide improved means for Introducing air and distributing it in an enclosure without drafts, such as are created by air entering from ordinary registers and grilles. The object is attained by causing the air to enter the enclosure at low velocity at distributed points over a large area. It is a further object of the invention to inccyrporate an acousticil treatment with the im- 15 proved ventilating system. It Is a further object of the invention to provide heating or cooling means, or both, in combination with the improved ventilating system. Other objects and advantages of the invention 20 will become apparent from a reading of the following- specification. In the drawing.@: Flg. 1 is a longitudinal, sectional view of an enclosure which is equipped with my Improved combined ventilating system and acoustical 2r)- treatment; Flg. 2 is a fragmental perspective view of a portion of the construction of Fig. 1; Flgs. 3, 4 and 5 are fragmental perspective views of modiflcations of the const:,uction of this 30 invention; Flg. 6 is a fragmental, sectioneil view of a further modification of the invention; Flgs. 7 and 8 are fragmental, sectional views of modifications of the Invention in which heat- 35 ing or cooling means, or both, are Incorporated with the ventilating means; and, Pligs. 9, 10 and 11 are perspective views of different modifleations of combined air-distributing and sound-absorbing units which may be used 40 In my invention. In Fligs. 1 and 2 there Is illustrated a building 10 containing a ventilating system In accordance ,with the invention. A one-room store building is shown for purposes of Illustration, having a 45 front wall I 1, a rear wall 12, a main floor 13 and a basement 14. A partition I 5 separates the main room 16, which is'to be ventilated, from a space 17 at the rear of the building. A number of beams 18 are suspended from 5o the ceiling 19 of the room 16 by means of relatively long bolts 20. Furring strips 21 are attached to beams 18 by suitable attaching means, such as nails or screws (not shown) and a sheetform foraminous member 22 is supported by the 55 furring strips. Foraminous member 22 Is of an area substentwly ecual to the area of the floor of room 16 and may be made up of a plurality of pan- like perforated tiles 23 of self-sustaining material. The tiles may be metal sheets, vul- 60 canized fiber sheets, bakelized sheets, wood (CL 98-43) veneer sheets, or the like. Within each tile 23, and substantially filling the same, is a panel 24 of sound-absorbing material. The assembly of these panels forms a partition between the foramino us member and the ceiling. The panels 5 may be composed of matted wood fibers, hair- felt, mineral wool, or of other suitable porous, air- pervious material. 7be axrangement of fur- ring strips, foraminous tiles and sound-absorb- 10 ing panels may be like that shown in my United States Patents Nos. 1,726,500 and 1,833,174 granted August 27, 1929 and November 24, 1931, respecti vely. The foraminous tile of the Sulli- van Patent No. 1,918,149, granted July 11, 1933 and the furring strips of the Weiss Patent No. 15 1,738,46 9, gr'anted December 3, 1929, may also be used The panels 24 may be spaced from the tiles 23 by means of spacing members 25. Such spacing avoids the uneven light reflection which may otherwise take place through the perfora- 20 tions of the tiles due to the surface irregularities of the panel. The ventilating system comprises an air Inlet conduit 27 which leads to an air conditionii@g unit 28. This unit may include apparatus for 25 washing, flltering, humidifying, cooling, etc. A condensi ng unit for a refrigerator is Indicated at 29. The air may be drawn through this ap- paratus by a fan 30 and forced into conduit 31, which may have a heater unit 32 associated 30 therewit h. The end portion of conduit 31 may have a lining of sound-absorbing material 33, faced with foraminous metal 34 or other forami- nous smooth-surfaced material (see Mg. 2). The entire conduit may be lined, but it has been 35 found in most cases to be sufficient to line a por- tion adjacent the fan outlet and a portion ad- jacent the conduit outlet. In view of the pres- ence of sound-absorbing material 24, a sound- absorbin g linlng at the end portion of the con- 40 duit is suimcient. The end portion of the con- duit may be flattened as shown. Registers or grilles 35 are located at distributed points in the lower portions of the walls of the room, and are connected to return conduits 36 and 37, 45 which may be used to conduct the air back to the air conditioning unit 28 and the fan 30, if it is desired to re-circulate the air. The space 38 between the collection of panels 24 and the ceiling 19 forms a plenum chamber 50 into which the air is introduced continuously by the air- circulating means. The air spreads free- ly and uniformly throughout chamber 38 and is maintain ed there at a pressure slightly above the pressure level In room 16 as will be er- 55 plained more fully hereinafter. 7be air passes through the sound-absorbing panels 24 and then through membi!r 22, the distribution of air ffow being substantially uniform throughout the area of the latt@r. Floraminous member 22 is of 60


2 2,172,771 sufficient area and the perforations therein are sufficiently numerous that the air passes through it at low velocity and descends into the room throughout its entire area in a gentle movement which is not perceptible to the occupants. There are no drafts, such as are present when an ordinary ventilating system, in which the oAr Is introduced into the room by means of grilles or registers, is used. 10 In the construction Illustrated in Mg. 3 a plurality of elongated hollow beams 42 are supported by pillors 43 beneath the ceiling 44 and are arranged in spaced, parallel relation. The hollow members 42 are connected at one end 6 15 the air inlet conduit 4 1. The air inlet condwt 4 i may,be arranged along the side wall 45 of the room as shown. It mgy also supply ventilating air to a similarly arranged construction In a room on the opposite side of wall 45. Foraminous 20 sheet-form tiles 46, carrying sound-absorbing panels 47, may be supported in any suitable manner between the hollow beams 42, and in spaedd relation to the ceiling 44. Plenum chambers 48 are thus formed between the tiles and the ceiling. 25 The tiles may be relatively large, as shown, and may have grooves 49 formed therein. These grooves give the appearance of smaller tiles for decorative purposes. The sound-absorbing panels may be large also, to conform with the size of the 30 tiles. This results in manufacturing and installation convenience and economy. , The hollow beams 42 have slots 50 in both side walls, the slots communicating with the plenum chambers 48. The entering air passes through air inlet conduit 41 35 Into hollow beams 42 and passes through slots 50, into the plenum chambers 48. It then pas-ses through the apertures In foraminous tiles 46 and downwardly into the room. Flg. 4 illustrates a construction In which the 40 foraminous member is supported directly by the supporting structure for the floor above, and forms the permanent ceiling of the room to be ventilated. It Is adapted especially for application to new buildings in which the ventilating 45 system is incorporated in the design of the building. The joists 55 support the floor 56 of the room above. The inlet conduit 57 for the ventilating air is arranged between two of the joists 55. Blocks 58 are attached to the bottom edges of 50 joists 55 at spaced intervals and furring strips 59 are attached to blocks 58. Foraminous tiles 60, carrying sound-absorbing panels 6 I are supported by furring strips 59 in the manner described heretofore. Blocks 58 serve to space panels 61 55 and the turned-up edges of the tiles 60 from the bottom edges of joists 55 so as to permit the fiee movement of the ventilating air into all of the space between the floor 56 and the panels 6 1. The construction of Mg. 5 is similar to that of 60 Mg. 4, except that the sound-absorbing panels are attached to the under side of the floor of the room above, instead of being carried.by the foraminous tiles. They are shown wrapped in sound-transparent coverings 62, an expedient that may be 65 i).sed to prevent sifting df the sound-absorbing material in'Lo the room below. The same numbers are used in Fig. 5 to designate parts corresponding to similar parts in Mg. 4. Fig. 6 shows a construction similar to that ,o shown in Mg. 4 except that the blocks 58 of Mg. 4 are omitted, and the sound-absorbing panels and the tiles are spaced from the bottom edges of the joists 55 by prgviding long legs upon the furring strips 59, as showii. This figure shows the en75 gagement between tongues 64 on the turned-up edges of -the tffes and the slots 83 In the furring strips. The same numbers are used In Ing. 6 to designate parts correqwnding to the parts of Mg. 4. N Mg. 7 shows a construction in which means are provided for heating and cooling the ventilating air In the plenum chamber. This construction also shows ix modification of the means for in- troducing the ventilating air Into the plenum chamber. The cetung 05 is shown as being com- 10 posed of concrete, with facing layer 68 of plaster, although It may be of any s@itable composition. Pipes 67 for containing the circulating heating or cooling means are embedded in the ceiling. The foramihous ttles 70 are supported in position by 1& supporting means of the type described and claimed In the SWlivan Patent No. 1,776,092, com- prising bolts 71 embedded in the ceiiing, clips 72, and furring strips 73. Inles 70 carry sound- absorbing panels 79 in the manner described here- 50 tofore. In order to conceal the furring strips ad- jacent the side walls 74 a border of narrow tiles 75 Is arranged as shown. The construction is omitted ' from one or more small areas of the ceiling and a fan 76 is In- 25 stalled at each such area by mounting the fan in a sidtable manner upon the ceiling. The fan is arranged to draw air upwardly out of the room and discharge it into the plenum chamber 77, be- tween the ceiling and the foraminous member 30 formed by the tiles 70. In such construction the circulating heating or cooling medium usually is water. Heat Is conducted from the pipes 67 to the surface layer 66 of the ceiling and radiated from this surface Into the plenilm chamber. It n is then carried downwardly by the air Into the room in a gentle movement over substantially the entire area of the room. As Indicated hereto- fore, the construction may be so arranged that during the warm weather pipes 67 carry a cooling 40 medium, such as cold water, In which case the ventilating system may be used to cool the room. A border of narrow finishing tiles 75 may be used around the areas occupied by the fans 76 as shown. Mg. 8 shows a construction in which the tiles making up the foraniinous member are supported in a manner siniilar to that described in Burgess application, Serial No. 503,542, fued December 19, 1930. A sheet--or plate-form supporting mem- 50 ber 80 Is attached to the ceiling 81 by suitable means, such as screws 82. Supporting member 80 has beams 83 depending therefrom, which beams may be in the form of Integral ribs of the plate 80. Beams 83 have openings therein, Indi- 55 cated at 84, to perniit the free flow of air into the entire plenum chamber. Beams 83 have flanges 85 at the ends thereof. Porous sound-absorbing panels 86 rest at their edges upon flanges 85 and extend adjacent ribs. Panels 86 are of rigid 60 construction and may be composed of cemented wood fibres, or may be the cerainic tiles of Kliefoth Patents Nos. 1,966,069 and 1,976,946. In this con- struction the sheet-form foraminous member may be omitted. A relatively large opening may 66 be provided In one of the panels and fan 87 may be arranged in such opening. Heating and cool- ing pipes 88 may be located in the plenum chamber and supported by means of straps 89 and rods 90, the latter being embedded In the To ceiling. The action is substantially the same as that described in connection with Flg. 7. The flow of air from the plenum chamber 91 Into the room is regulated - by the porous, air-pervious sound-absorbing tiles $6, Heat is radiated from


2,172,771 3 pipes St and carried Into the room by the moving air. It has been stated heretofore that the sound absorbing panels are of porous air-peridous composition. I'hese panels are relatively thick, usually about one inch thick and if the air Is cr.used to pass through them, as it does In the construction of Mgs. 1, 2 and 8, they provide a means for regulating the flow of air from the 10 plenum charnber Into the room because of the resistance they offer to the flow. 7be foraminous member frequently Is of sufficiently open character that unless additional means are provided for thus regulating,the flow, a large proportion 15 of the air follows the path It would naturally take -if theie were no pienum chamber. For even distribution over the entire area of the foraniinous member, the resistance to flow therethrough ahould be such that a slight, but appreciable pres- 20 sure is built up in the plenum chamber. By making the tliick sound-absorbing panels of the proper density and arranging them so that they are subrtantially co- extensive with the tiles, they afford the required resistance and substantlally 25 uniform flow Is obtained over the entire area of the- foraniinous member. Uncovered panels one inch thick, composed of mgtted wood fibres and weighing about 0.40 pound per square foot, marketed under the trade-mark "Balsam-Wool" 30 are satisfactory e purpose. In accordance with this invention, a slight pressure may be maintained In the plenum chamber and uniform distribution of air flow obtained without causing the air to pass through the 35 sound-absorbing panels. This is accomplished by enclosing the individual panels In sound-transparent Wrappers which are substantially impervious to the passage of air under the condttions of use and spacing the panels a slight dis- 40 tance apart so that resistance Is offered to the flow of air between adjacent panels and the desired slight pressure'@ Is built up In the plenum chamber. The assembly of panels forms the controlling partition through which eAr may pass 45 at predetermined points and at a predetermined rate of flow. Such a wrapper may be a th"n paper or metal foil wrapper, as shown in Flig. 10. Such a wrapper does not impair the acous@.-ic effectiveness of the sound absorbing panel. The 50 wrapped panels may. be placed in contiguous relation to the foraminou.4 member, that Is, in contact therewith or in spaced adjacent relation thereto. Where the fommtnous member is made up of a plurality of pan-shaped tiles the wrapped 65 panels should be slightly smaller In length and width than the tiles. To give a prac cal example, in a construction where the lndividtial tiles are two square feet in area, the foraminou.9 member is 350 square feet In total area and the 60 flow of ventilating airi into the room varies from 500 to 3500 cubic feet per rninute, panels which are one-half inch smaller than the tiles in both length and width, providing one-fourth inch spacing between the correspond"ng edges of each 65 panel and tile, have been found to be satisfactcry. An appreciable pressure Is maintained in the plenum chamber and a steady, uniformly distributed flow is obtained under such conditions. With a half inch spacing between the correspond- 70 ing edges of the panels and the tiles in this construction the pressure In the plenum chamb@-r is negligible and the flow Is not uniformly distributed. The spacing requirements vary for different conditions of air flow rate, tile size and area ib of the foraminous member. Uniform distribution of. air flow may also be obtained by arranging the wrapped panels upon the ioraminous member so as to be Increasingly close together as they approach the, areas where the air would otherwise flow through the forami- 5 nous m6mber In the greatest quantities. , This may not be the area lrr=ediately adjacent the point where the air enters the plenum chamber. Where the outlet of the air supply conduit Is sub- stantially parallel with the surface of the fo- 10 raminoiis member, as shown In Mgs. I and 2, the air naturally turns downwardly into the room at a considerable distance from the end of the ronduit. Such graduated spacing is particularly useful where the air flow is small and little or no 15 air pressure is maintained In the plenuin chamber. The spacing may be obtained by providing the wrapped sound-absorbing panels in varying sizes, the larger ones almost conipletely filling the fo- raminous tiles, and the smaller ones leaving 20 spaces between the edges of panels and the turned- up edges of the tiles, Such arrangements are lf- lustrated In Flgs. 9 and 10. In Flig. 9 the forami- nous tile 92 contitins porous sound-absorbing panel 93 which is enclosed in paper or metal foil 25 wrapper 94. The wrapper may be folded at the ends of the panel, as shown at 95. The panel is spaced from the tile face by means of spacing members 96. The panel 93 almost'fills tile 92, that is, i length an wi are only slig y less 50 than the length and width of the tile. Space' should be provided, along two sides for the ac- commodation of the legs of the furring strips, which are located inside the turned-up edges of the tiles, see Figs. 6 and 7. In such an arrange- 35 ment the passage of the ventilating air through the foraminous tile 92 is greatly restricted. Having passed thr'ough the openings between adjacent panels the. air spreads over the face of tile 92 and passes downwardly into the room. The same re- 40 sult may be obtained with an unwrapped panel if the top or the bottom surface of the panel Is covered with a layer of paper or metal foil. Mg. 9 also shows the tile 92 as being of greater length than width and having a groove 97 ex- 45 tending across the middle thereof whereby it has the appeargnce of being two tiles of square shape. In Mg. 10 an arrangement is shown in which the sound-absorbing panel is substantially smaller than the tile. The same numbers are used In 50 Fig. 10 to designate parts corresponding to the numbered parts of Fig. 9. This arraiigement al- lows substant'lally unrestricted flow betveen the panel and the turned-up edges of the tile. It may be perm!ssible in some installations to 55 omit the spacers 96 between the tiles and the sound-absorbing panels as shown in Fig. 11, In which ca6e the desired distribution of air flow is obtained by the blocking off of the portions of the tiles which are covered by the panels rather than 60 by restricting the flow between the edges of tlle panels and the turned up edges of the tiles. In such arrangements smaller panels, are used since a greater area, of the foraminous member Is re-quired to provide a flow equal to that provided 65 by the free spaces between the edges of adjacent panels. The same numbers are used in Fig. 11 to designate parts corresponding to the parts of Mgs. 9 and 10. A further arrangement for providing uniform 70 flcw over the area of the foraminous member is illustrated in F@g. 4. In this arrangement, alter- nate cnes of the s(>und-absorbing panels 61 are enclcsed in sound-transparent and substantially air-impervlous wrappers 62. The panels substan- 75


4 2,172,771 tially fill the corresponding foraminous tiles 60 with the result that the passage of air is prevented through these tiles containing the wrapped panels. Such construction is particularly useful where the panels are composed of a material of such open porosity that insufficient pressure ismaintained in the plenum chamber if all of the panels are unwrapped. @ I claim: 10 1. In a ventilating system, the combination with a wall or ceiling of a space to be ventilated, of an extended sheet-form foraminous member spaced interiorly from said wall or ceiling, a part'@ti3n of substantially air-impervious material 15 having distributed openings therethrough between s a,. -d foraminous meniber and said wall or'ceiling and in spaced relation to said wall or ceiling to form a plenum chamber between said partition and soid wall or ceiling, and means for introduc- 20 ing ventilating air into said plenum chamber, the total area of said openings In said partition bearing su.-h relation to the total area of said parti'.ion that said air Introduced into said plenum c-iamber builds up a low but appreciable pressure 25 therein, whereby to cause said air to pass. tbrough substantially all of the openings of said partition at stibstantially the same velocity. 2. In a ventilating system the combination with a wall or ceiling of a spa@e to be ventilated, 30 of an extended sheet-form foraminous member spaced interiorly from said wall or ceiling to form ail enclosure therebetween, a partition of subs' -antially air- impervious material within said enclosure substantially parallel to said foraminous 35 member and spaced from said wall or ceiling to form a chamber between said partition and said wall or ceiling, a, plurality of openings in said partition, and means for introducing air into said chamber, said partition being of such area and 40 said openings therein being so arranged that air enters the room at low velocity. 3. In a ventilating system, the combination with a wall or ceiling of a space to be ventilated, of an extended sheet-form foraminous member 45 spaced interiorly from said wall or ceiling, a plurality of substantially air-impervious panels positioned in a plane between said foraminous member and said wall or ceiling and in spaced relation to said wall or ceiling to form a plenum chamber 50 between said air-impervious panels and said wall or ceiling, and means for introducing ventilating air into said plenum chamber, said air-impervious panels being spaced apart in such relation to each other that the total area of opening between said 5r) panels bears such proportion to the total area of said air-impervious panels that said air introduced into said plenum chamber builds up a lo* but appreciable pressure therein whereby to cause said air to pass between said air-impervious pan- 60 els at a velocity substantially uniform throughout the area of the totahty of said air-impervious panels. 4. In a ventilating system, the combination with the ceiling of a space to be ventilated, of 65 an extended sheet-form foraminous member spaced interiorly from said ceiling, a partition of substantially air-impervious material having distributed openings therethrough between said foraminous mernber and said ceiling and in spaced 70 relation to said ceiling to form a plen,,im chamber between said partition and said ceiling, means for introducing ventilating air irito said plenum chamber, and means for exhausting said air from said space at one or more points near the floor 7r, thereof, the total area of said openings in said partition bearing such relation to the total area of @ said partition that said air introduced into said plenum chamber builds up a low but appreciable pressure therieln.whereby to cause said air to pass through substantially all of the open- 5 ingg of said partition at substantially the same velocity. 5. In a ventilating system', the combination with a wall or ceiling of the room to be ven- tilated, of a sheet-form foraminous member 10 spaced interiorly from said wall or ceiling to form a chamber, a substantially air-impervious mem- ber upon said foraminous member, said air-im- Pervious member incompletely covering said fo- raminous member to form distributed small un- 15 covered areas, and means for introducing ven- tilating air into said chamber, the uncovered area of said -f craminous member being such that a slight pressure is maintained iri said chamber. 6. In a ventilating system, the' combination 20 with a wall or ceiling of the room to be ventilated, of a sheet-like foraminous member 8paced in- teriorly from said wall or ceiling to form a cham- ber, a plurality o'f sound-absorbing units in said chamber and contiguous to said f orami nous meni- 25 ber, sound-transparent but substantially air- impervious covers for said units, and'rneans for introducing ventilating air into, the space be- tween said units and said wall or ceiling, said 'Linits being arranged in such proximity to one 30 another that substantially even distribution of air flow is obtained throughout the area of said foraminous member. 7. In a ventilating system, the- combinatic)n with a wall or ceiling of the room to be ventilated, 35 of a sheet-forin foraminous member spaced in- teriorly from said wall or ceiling to form a chamber, a plurality of sound-absorbing units upon said foraminous member and in contact therewith, sound-transparent and substantially 40 air-impervious coverings for said sound-absorb- ing units, and means for introducing ventilating air into said chamber, said absorbing units in- completely covering said foraminous member, the uncovered area of said foraminous member being 45 such that a slight pressure is maintained in said charriber. 8. The construction of claim 7 in which the sound-absorbing units are in the form of panels of porous sound-absorbing material and the cov- 50 erings are in the form of wrappers of substan- tially air-impervious sheet material. 9. In a ventilating system, the combination with a wall or ceiling of a ro-om to be ventilated, of a sheet-form foraminous member spaced in- 55 teriorly from said wall or ceiling to form a cham- b-er, a sound-absorbing but substantially air-im- pervious member upon said foraminous member, said air-impervious member incompletely cover- ing said foraminous member to form distributed 60 -cmall uncovered areas, and rneans for introducing ventilating air into said chamber, the uncovered area of said foraminous member being such that a slight pressure Is maintained in said plenum charnber. 65 10. In a ventilating system, the combination with a wall or ceiling of a space to be ventilated of an extended sheet-form foraminous rnember spaced interiorly from said wall or ceiling to form an enclosure therebetween, a partition of sound- 70 absorbing su@stantially air-impervious material within said enclosure substatially parallel to said fo@raminous member and spaced from said wall or ceiling to form a chamber between said par- tition and said wall or ceiling, a plurality of dis- 75


2,172,771 5 tributed passageways through said partition, and means for Introducing air into said chamber, said partition being of such area and said passageways being so dimensioned and arranged that air enters the room at low velocity. 11. In a ventilating system, the combination with a wall ur ceiling of a space to be ventilated of an extended sh4@et-forin foraminous member spaced lnteriorl from said wall or ceiling to form . y 10 an enclosure therebetween, a partition of soundabsorbing material having a substantially airimpervious covering within said enclosure su.bstantially parallel to said foraminous member and spaced from said wall or ceiling to form a 15 chamber between said partition and said wall or ceiling, a plurality of distributed passageways through said partition, and means for introducing ventilating air Into said chamber, said partition being of such area and said passageways therein being so dimensioned and arranged that 20 air enters the room at low velocity. 12. In a ventilating system, the combination of floor, longitudinal joists supporting said fIGor, sheet-like foraminous member mounted in 25 spaced relation to said fl(>or and to the bottom edges of said Joists to form a chamber, a plurality of sound-absorbing units In said chamber and 6ontiguous to said foraminous member, soundiransparent but substantially air-impervious 30 covers for said units, and means for introducing ventiliting, air into the space between said units and said floor, said units being arranged in such proximity to one another that substantially even distribution of air flow is obtained throughout 35 the area of said foraminous member. 13. In a ventilating system, the combination of the ceiling of the room to be ventilated, a ventilating duct extending adjacent the surface of said ceiling, means for suppwng ventilating air 40 to said duct, a plurality of hohow beams extendIng from said ventilating duct and supporting said ceiling and arranged in spaced relation to each other, said ventilating duct having openlngs to communicate with the interior of said 45 hollow beams, and sheet-form foraminous members extending between said hollow beams and in spaci@d substantially parauel relation to said ceiling and substantially covering the exposed area of said ceiling, said hollow beams having openings 50 therein connecting with the spaces between said foraminous members and said cefling, the total area of said foraminous members being such that the ventilating air passes through said members into the room to be ventilated at low velocity. 55 th 14. In a ventilating system, the combination of e ceiling of a room to be ventilated, a ventilating duct extending adjacent the surfa;ce of said ceiling, means for supplying ventilating air to said duct, a plurality of branch ducts connected 60 to said fint duct and extending subjaeent said ceiling ip spaced relation to each other, and sheetform foraminous members extending between said branch ducts and in spaced substantially parallel relation to said ceiling and substantially 65 covering the exposed area of said ceiling, said branch ducts having openizigs therein connectIng the interiors thereof with the spaces between said foraminous members and said cefling adJacent thereto, the total open area of Wd foram- 70 lnous members through which air may paw being such that Wd air passes through aWd members into the room to be ventflated at substantially uniform velocity throughout the area tblerept. 15. In a ventilating system, in combination, a room to be ventilated and a ceiling thereof, a plurality of substantially parallel ventilating ducts adjacent said ceuing, means for continuously supplying ventilating aii to said ducts, an apertured sheet-like member of sound-absorbing material spaced from said ceiling, and distributed openlngs in the walls of said ducts betwen said ceiling and said apertured member, said apertured mem- ber being so constructed that air passing from 10 said ducts through said openings in the walls thereo f Is caused to pass through substantially all apertures In said member at a substantially unifor m velocity. 16. In a ventilating system, the combination of 15 a wall or ceiling of the rc>om to be ventilated . a, sheet- like foraminous member of sound-absorb- ing material spaced from said wall or ceiling to form a chamber, said foraminous member hav- ing an area comparable to the wall or ceiling area of said room, said foramin(>us member having a 20 relativ ely large opening therein, said opening be- ing in direct communication with said room and said chamber, and air-impelling means located In said opening and adapted to Impel air from 25 said room through said opening into said cham ber. 17. In a ventilating system, the combination of a wall or ceiling of the room to be ventilated, a sheet- like foraminous member of sound-absorb@ 30 ing material spaced from said wall or ceiling to form a chamber, said forELminous member hav- ing an area comparable to the wall or ceiung area of said room, said foraminous member having a relatively large opening therein, said opening be- '35 ing in direct communication with said room and said chamber, air-impelling means located in said opening and adapted to impel air from said room through said opening Into said chamber, and means for heating the air in said chamber. 40 18. In a ventilating system, the combination of a wall or ceiling of the room to be ventilated, a sheet- like foraminous member of sound-absorb- ing maierial spaced from said wall or ceuing to form a chamber, said foraminous member hav- 45 ing an area comparable to the wall or ceiung area of said room, said foraminous member having a relativ ely large opening therein, said opening be- ing In direct co-munication with said room and said chamber, air-impelung means located in said opening and adapted to impel air from Wd 50 room through said opening into sWd chamber, and air heating and cooling pipes located in said cham ber. 19. In a ventilating system, the combination 55 with a wall or cefflng of the room to be venulated of a- sheet-like foran2inous member spaced interiorly from Wd wall or ceiling to form a chamber. a plurahty of sound- absorbing units in said chamber and contiguous to said forami- so nous member, sound- tmnsparent but substantially air-impervious covers for said units, means for Introducing ventilating. air into the space between said units and said wall or ceiung, and means for varying the temperature of the air in said chamber, said units being arranged In such proximity to one another that a predetermined distribution of air flow is obtained throughout the area of aWd fornminous member. RALPH P'ORBUSH NORRIS. TO

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