American Society of Heating and Ventilating Engineers Guide, 1934 DESIGN OF DUCT SYSTEMS The duct system should be large enough to transport the fumes or material without causing serious obstruction to the air flow.

American Society of Heating and Ventilating Engineers Guide, 1934 Flanged fittings are generally used in the best practice for connecting all piping above 6 in. in diameter.

American Society of Heating and Ventilating Engineers Guide, 1934 separate top and bottom halves.

American Society of Heating and Ventilating Engineers Guide, 1934 Example 1.

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American Society of Heating and Ventilating Engineers Guide, 1934 density..

American Society of Heating and Ventilating Engineers Guide, 1935 where Ut -- heat transfer expressed in Btu per hour per square foot per degree difference in temperature between steam and air, for transverse flow.

American Society of Heating and Ventilating Engineers Guide, 1935 creasing amounts of oils and tars are given up.

American Society of Heating and Ventilating Engineers Guide, 1935 main heaters at the fan location, booster heaters may be located in branch ducts.

American Society of Heating and Ventilating Engineers Guide, 1936 c. = 3.46 lb per minute per ton. d. 9000 X 33 qqq = 0.944 hp per ton. e. 200 + 0.944 X 42.5 = 240 Btu per minute per ton.

American Society of Heating and Ventilating Engineers Guide, 1936 Correct comparisons should take into consideration many different factors, including conductivities or conductances, thicknesses installed and manner of installation, while the selection of an insulation should also give consideration to structural qualities, as well as to material and application costs.

r~ American Society of Heating and Ventilating Engineers Guide, 1936 the temperature, humidity, and motion of'the air within ;`the conditioned space.

' American Society of Heating and Ventilating Engineers Guide, 1936 In exhaust ventilating systems where the air column moves toward the fan, noise due to the higher tip speeds and outlet velocities will not be so readily transmitted back through the air column to the building as when the air column is moving toward the rooms.

American Society of Heating and Ventilating Engineers Guide, 1936 3 Iti the ordinary vacuum system1 of steam heating, where does1 the vacuum usually exist?

American Society of Heating and Ventilating Engineers Guide, 1936 SIZING AN UP-FEED RISER When the riser is an up-feed, the opposite condition occurs; that is, there is a drop in pressure as the top of the riser is approached, due to the natural reduction in the gravity pressure, and to this must be added the pipe friction plus that introduced by the pipe fittings, all of which produce an excessive drop when compared to the conditions existing with a downfeed riser.