w1 Heating Ventilating Air Conditioning Guide 1938 average eye is around 50 microns all air floated material of this kind is too small to identify without the aid of the microscope.

Heating Ventilating Air Conditioning Guide 1938 arbitrary rule is to increase the heating surface on floors above neighboring buildings by an amount ranging from 5 per cent to 20 per cent.

Heating Ventilating Air Conditioning Guide 1938 308 American Soctett or H eating and Ventclating Engineers Beating, Piping and A ir Conditioning Contracton National Auociaiion Chapter 16.

Heating Ventilating Air Conditioning Guide 1938 retical sizes, however, should be modified by not using a wet return less than 2 in. while the main supply, g-h, if from the uptake of a boiler, should be made the full size of the main, or 3 in.

Heating Ventilating Air Conditioning Guide 1938 HANGERS AND SUPPORTS Heating system piping requires careful and substantial support.

Heating Ventilating Air Conditioning Guide 1938 FURNACES Furnaces for mechanical warm air systems may be made of cast-iron, steel, or alloy.

Heating Ventilating Air Conditioning Guide 1938 centages of their wide-open capacity.

Heating Ventilating Air Conditioning Guide 1938 Meter Accuracy Guarantees, (N.D.H.A.

Heating Ventilating Air Conditioning Guide 1938 Tenkonohy, R.

Heating Ventilating Air Conditioning Guide 1939 in factory buildings, but now wall type radiators are most frequently uSC(j for this service.

Heating Ventilating Air Conditioning Guide 1939 TYPES OF AUTOMATIC CONTROL Operating Media or Source of Power Supply Automatic control systems may be classified in three broad groups based upon their primary operating media or source of power, as follows: 1.

Heating Ventilating Air Conditioning Guide 1939 minimum number of manholes will be required when an expansion bend, or an anchor with double expansion joint, is placed in each manhole and the pipes are anchored mid way between manholes. 6.

Heating Ventilating Air Conditioning Guide 1939 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.

'.V In this Catalog Data Section of The Guide 184 manufacturers describe the most modern types of heating, ventilating and air con ditioning equipment and materials--259 pages of valuable data, profusely illustrated.

Heating Ventilating Air Conditioning Guide 1939 HOLLAND, George R. (5 1938) Asst.