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PLAINTIFF'S EXHIBIT RMC-636 Heating Ventilating Air Conditioning GUIDE 1944 An Instrument of Service prepared for the Profession--Containing a ^ Technical Data Sectioti OF REFERENCE MATERIAL ON THE DESIGN AND SPECIFICATION OF HEATING, VENTILATING AND AIR CONDITIONING SYSTEMS' BASED ON--- THE TRANS ACTIONS--the Investigations of the Research Laboratory and Co operating Institutions--and the Practice of the Members and Friends of the Society together with a Manufacturers* Catalog Data Section \ Containing Essential and Reliable Information concerning 9 Modern Equipment also The Roll of Membership of the Society'* * WITH t. Complete Indexes to Technical and Catalog Data Sections Vol. 22 $5.00 per Copy Published Annually by American Society of Heating and Ventilating Engineers 51 Madison Avenue New York, N. Y. 7f Veber y and :tober re, by 1934). N. V. on of fiscel- riONs, ating, ndsay >. 335- L. L. 3gden * with Is and ;mber, CHAPTER 40 industrial Idxhaust Systems Classification of Systems, Hood Design Principles, Require ments for Suction and Velocity, Duct System Design, Col lectors, Resistance of System, Efficiency of Exhaust Systems, Types of Fans, Protection Against Corrosion IN many industries some type of exhaust system designed to collect and remove dusts and fumes is essential to the efficiency, economy, and safety of operation. General design information is included in this chapter which is intended to relate primarily to industrial exhaust systems. CLASSIFICATION OF SYSTEMS In general there are two basic layouts of exhaust systems, the central and the multiple unit system. In the central system a fan is located near the center of operations with a piping system radiating to the various machines to be served. In the multiple unit system, which is sometimes employed where the machines to be served are widely scattered, or where the operations are apt to be independent or intermittent, small individual exhaust fans are located at the center of the machine groups or at each machine. The unit arrangement has the advantage of flexibility. Exhaust systems *are also classified by the means employed to collect the material. The dust or refuse may be collected and- controlled by enclosing hoods or open hoods with positive inward air movement or by exhausting the general air of the room. With some classes of machinery it is not feasible to hood the machines closely and in these cases open hoods over or adjacent to the machines are provided to collect as much as possible of the dust and fumes. This class includes such machines as rubber mills, package filling machinery, sand blast, crushers, forges, pickling tanks, melting furnaces, and the unloading points of various types of conveyors. The open hoods should be placed as close to the source of dust or fumes as possible, with due regard to the movements of the operator and should be placed so that the operator is in no case in the path of the exhausted material. When the hood must be placed at some distance above the machine it should be large enough to cover a large area as diffusion is usually quite rapid. Some consideration should be given to the natural movement of the fumes. For those that are lighter than air, the hood may be over or above 717 HEATINC VENTILATING AIR CONDITIONING GUIDE 1944 For additional information on dust and cinders, see Chapter 2Q Air Cleaning Devices. RESISTANCE OF SYSTEM The maintained resistance of the exhaust system is composed of three factors: (1) loss through the hoods, (2) collector drop, and (3) frictio^ drop in the duct system. n The loss through the hoods is usually assumed to be equal to the suction maintained at the hoods. Where possible the resistance of the particula collector to be used should be ascertained from the manufacturer. r Friction drop in the pipes must be computed for each section where there is a change in area or in velocity. Find the velocities in each section of pipe starting with the branch most remote from the fan. The friction drop for these sections can be determined by reference to Table 6 and Fig. 2, Chapter 32. Total friction loss in the piping system is the friction drop in the most remote branch plus the drop in the various sections of the main, plus the drop in the discharge pipe. Table 7. Accepted Standards for Toxic Concentration of Fumes, Dusts and Mists4 Fumes Cadmium oxide................. ........... .............. ................. ... Lead or oxides of lead. ..... ..................... ............. .................................... Mercury or mercury compounds Pen ta ch lorona ph tha lene Trichloronaph tha lene Zinc oxide ................................ .................. Dusts Asbestos Cement ......... ...................................................... .................................... Gypsum..... ............... ............................................................. T.ead or compounds of lead Manganese ...... .................... ........................ Marfile . . . . .. Silica (more than 70 per cent free silicon-dioxide) Silica (more than 10 per cent free silicon-dioxide) Silica (less than 10 per cent free silicon-dioxide) Mists Chromic acid .. Sulphuric acid....... .............................................................................................. Milligrams per Cubic Meter 0.1 1.0 0.15 0.1 0.5 5.0 15.0 ~ Million Particles per Cubic FooTb 5 100 100 0.15c 6C 100 5 10 100 Milligrams per Cubic Meter 0.1 5.0 ^Adapted from Safe Concentrations of Certain Common Toxic Substances Used in Industry, by M. Bowditch, C. K. Drinker, P. Drinker, H. A. Haggard, and H. Hamilton (Journal of Industrial Hygiene tm Toxicology, Vol, 22, No. 8, June, 1940). Industrial Code Bulletin No. 35 (New York State Labor Depart ment). Study of Aabestosis in Asbestos Textile Industry (17. 5. Public Health Bulletin No. 241, 19381. Chronic Manganese Poisoning in an Ore Crushing Mill (17. S. Public Health Bulletin No. 247, 1940). bDetennined by light field or equivalent technique. cMilligrams per cubic meter. 730 Insuiati0n ALFOL Alfol Insulation Company Incorporated 155 East 44th St., New York, N. Y. Agents in Principal dries HEAT INSULATION for ALL PURPOSES ALFOL PRE-FABRICATED INSULATION PANELS FOR TANKS, TOWERS, AND ALL TYPES OF HEATED EQUIPMENT Metal Jacketed Panels con taining insulation best suited for each particular condition. Removable and Replaceable by means of Lock-Joint con struction. Shop Fabricated with Cut outs for manholes and pipe connections. PrePibricated Panel. At Right-- 4 p pited to Tcnt'er Easily and Rapidly Applied by any type of labor. Trim Appearance with mini mum of up-keep. FOR MORE DETAILED INFORMATION WRITE FOR ALFOL PANEL DATA BOOK ' ALFOL HOUSE INSULATION BLANKET Pure Aluminum Foil spaced on three-ply thick paper vapor barrier sheet. SinglY and Double Layers insure spaced sheet to reduce conduction and convection. Ap plied between structural members or furring, Alfol Blankets give high msuia-- tion value at low cost. Specifications Description Net Area Net Wetfht Width** \ per Roil . per Rati:-. Type I.-- 1 Layer ALFOL !6'-2r 250 sq. ft. 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It is not subject to attack by REYN-O-CELL Is Easily Installed rodents, and does not harbor vermin or Send for literature describing Reyn-O- other insects. It is odorless, and will Cell; and its many advantages in existing not decav. i houses as well as new construction. 1155 - --- ------------ ------------ ; t: