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PLAINTIFF'S EXHIBIT inter* Psrahaalag April 25. 1958 MHPr#. 0O*.

'J J Bestwall Gypsum Company FOR PaolfiCLtfV.NY DATE ATTENTION OF Mr.

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j June 29, 29SI I' TOi Hr* R.

AIA FILE NUMBER 23-L otrum asmjiiaiiun 201 NO WELLS 5T, CHICAGO 6, ILLINOIS 1350 N.

KnHCRAh'DUH - Thermoid Company - Southern Division, Charlotte, N.

Heating Ventilating ' Air Conditioning Guide 1950 Exhaust systems (continued) hoods (continued) axial velocity formula for, 923 canopy, 925 capture velocities 921 chemical laboratories, 926 design principles, 920 kitchen, 927 large open, 925 lateral exhaust, 926 low velocity systems, 924 spray booths, 926 suction, 921 velocity contours, 925 resistance of, 930 suction requirements, 923 types of fans, 931 velocity requirements, 921,928 Expansion factor, gaees, 89 of pipe, 482, 562 orifice plates, 85 tank piping, 498 tank size, 498 tanks, 498 valves, 784 F- Fan, fans, 439, 675 application, 689 arrangement of drives, 684, 686 attic, 691 location, 691 types, 675 axial flow, 675 centrifugal, 675 characteristic curves, 680-682 control, 686 designations, 684, 685, 686 efficiency, 677 furnace system, 425 installation, 689 laws, 677 motive power, 687 noise generated, 681, 683, 848 performance, 679 radial flow. 675 selection of, 687 air conditioning systems, 687 industrial exhaust systems, 941 ' speed, 677 system characteristics, 683 volume control, 686 Fanning formula. 77 Fever therapy, 145 equipment for production of. 145 Film conductance, 103, 169, 172, 178, 749 coefficient, 103, 172, 178, 749, 752 Filter, filters, 693, 704 air conditioning units, 544, 549 dry air, 693, 696, 962 dust, 693 installation, 700 performance, 697 selection, 699 testing, 697 viscous automatic, 695 viscous impingement ' type, 694 Fittings, 418, 432, 557 pipe allowance, 419, 432, 459, 487, 930, 984 types of, 419. 432, 557 Flexible mountings, 862 Float trap, 474 Floor cooling unit, 548 heat transfer coefficients. 190. 191 unit heater, 553 Flow coefficients, orifices, 86, 87 compressible fluids, 81 critical, 79 measurement liquids, 91 orifices, 83, 93 ' Pitot tube, 95, 1005 . steam, 90 Flow meters, 97, 597, 983 Flue gas loss, 316. 318 Fluid flow, 75 theory, 75 Fluid meters, 97, 597 Fog, 4, 154 Force, 4 Forced air heating system, 425 circulation pipe sizes, 495 convection, 104, 749 Free convection, 104 enthalpy, 4 Friction loss air ducts, 440, 641, 642, 643 circular pipes, 77, 641 elbows, 419, 432, 459, 487, 930, 984 gas piping, 348 non-circular pipes, 80 refrigerant piping, 787 water heating, 487 water piping, 487, 980-982 Fuel, fuels, 303 burning equipment, 329, 353 classification, 303, 307 * consumption, 399 degree-day method.- 402 load factor, 413 . maximum demands, 413 seasonal efficiency, 413 firing methods, 319-323 unit consumption, 407 utilization, 368 Fuel oil. 307 carbon residue, 308 classification of, 307 ^ combustion of, 314 grade of, 309 maximum carbon dioxide val- ues, 315, 343 theoretical air requirements, 314.343 viscosity, 308,342 Fumes, 4. 153 Fundamentals, beat transfer, 101 Furnace, furnaces. 4, 353. 367 capacity, 369, 370, 371 casings, 373 cast iron, 369 design, 372 efficiency, 372 fan, 368 gas-fired units, 344 gravity warm air, 367 Furnace.

94 CHAPTER 4 1950 Guide Fluid Flow 95 FLOW MEASUREMENT BY PITOT TUBE There remains one other head type meter useful in ventilating work, , Pitot tube named for the Frenchman who discovered the principle.

112 CHAPTER 5 1950 Guide this chapter indicate the magnitudes of the thermal conductivities, k, to be employed in the expressions of Table 6, after dividing k by 12.

318 CHAPTER 13 1950 Guide Fuels and Combustion 319 total loss in flue gas in per cent TOTAL LOSS, in .

642 CHAPTER 31 1950 Guide Air Duct Design - 643 CU.

F riction and Cap, !