PLAINTIFF'S EXHIBIT Q-.

^s, has served as it since 1931.

Air Hygiene Foundation, 4400 ^ifth Avenue, Pittsburgh, Pa.

Air Hygiene Foundation of America, Inc. 4400 Fifth Avenue, Pittsburgh, Pa.

American Society of Heating and Ventilating Engineers Guide, 1930 high-temperature drying heat and humidity control internal moisture gradient low-temperature drying methods mechanism of drying moisture content calculations omissions in drying cycle radiant heat removal of free water selection of fans stages of moisture diffusion vacuum drying ventilation phase Ducts exhaust systems friction in elbows friction losses fundamentals of design installation insulation proportioning warm air furnaces, for Dust collectors conveyor pipes definition of determinations exhaust systems fans for collecting and conveying removal efficiency of air cleaners Page 471 481 479 471 469 474 .482 476 470 477 437 474 472 487 452 449 447 445 452 456 449 134 466 467 181 103 457 438 187 E Economic thickness of pipe insulation 416 Effective temperature 85, 93 Efficiency of employees, airconditioning for 160 Ejector type ventilators 115 Electric motors and controls for mechanical stokers 215 Electricity heating costs heat equivalents of hot water heaters hot water heating system storage system warm air heating system 247, 248 249 249 249 248 249 Enclosures, effect of on heat emission of radiators 280 Equilibrium moisture content in drying 479 Evaporation rate of temperature of , 166 162, 163 Exhaust systems, pneumatic air velocity calculations, conveyor pipes .design of hoods maintenance requirements of efficient operation types typical layout 459 464 467 467 468 458 457 464 Expansion and contraction of piping 306, 419 Expansion of solids, table of 518 Experimental technique in design of dryers 489 F Factory temperature control Falling rate period In drying Fans arrangement of drive centrifugal characteristic curves ' designation of > disc and propeller drying dust collecting and conveying 294 475 443 433 432 443 432 437 438 full backward curve'multiblade motive power selection ventilation Ferrous pipe Fiber saturation point in drying Filters, air Fittings, insulation for Flow of steam in pipes Flues, cleaning of Forced circulation hot water heating warm air heating Forward curved multiblade fans Friction in duct elbows Friction losses in air ducts Fuel oils for domestic heating Fuel saving with insulation Full backward curve multiblade fans Fumes, definition of Furnaces, warm air fan pressure arrangement of heaters description of design of fuels gas-fired residence system large buildings rating selection of heaters small buildings specifications for residence system Furnaces, warm air gravity calculating heat losses code for installing design of ducts forced or booster circulation grilles leader pipe sizes register area recirculating ducts and grilles size of wall stacks G Gas air for combustion boilers chimneys cross-connecting boilers control features conversion burners calorific value fuel costs insulation and weatherstripping requirements of buildings ratings for appliances selection of boilers space heaters table of properties warm air furnaces Generators, ozone Gravity circulation hot water heating warm air heating Gravity steam-heating systems definition one-pipe one-pipe down feed two-pipe vapor Gravity ventilating systems Greenhouse heating Greenhouse temperature control Grilles for warm air furnaces Page 435 439 436 436 299 477 184 416 334 274 379 148 434 449 447, 449 235 31 435 181 154 149 151 150 157 153 150 153 156 158 129 141 128 134 148 134 129 134 134 136 132 218 227, 228 258 230 230 224 217 219 224 220 229 228 228 522 227 494 367 127 331 341 343 343 345 119 499 296 134 via Alphabetical Index to Technical Data Section H Page Hand fired boilers Hartford return connections 211 360 Heaters _ .

' American Society of Heating and Ventilating Engineers Guide, 1930 take the wall having the most crack; and with three or four exposed walls, take the wall having the most crack, but in no case take less than half the total crack.

American Society of Heating and Ventilating Engineers Guide, 1930 11.

American Society of Heating and Ventilating Engineers Guide, 1930 The correction factors for different atmospheric pressures and different flue-gas densities are the same as.given for the losses in the chimney.

Copyright, 1931 BY American Society of Heating and Ventilating Engineers AND BY IT Dedicated .

American Society of Heating and Ventilating Engineers Guide, 1931 Table 24.

American Society of Heating' and Ventilating Engineers Guide, 1932 Table 18.

ff American Society of Heating ami Ventilating Engineers Guide, 1932 rates of combustion.

/ American Society of Heating and Ventilating Engineers Guide, 1932 Ko 1 377 ,,kRt re.

American Society of Heating and Ventilating Engineers Guide, 1934 different from those in factories, since there must be a considerable volume of air circulated in order to provide ventilation and cooling.

American Society of Heating and Ventilating Engineers Guide, 1934 jo too iso .