AMERICAN SOCIETYOF HEATING & VENTILATINGENGINEERS GUIDEB23 If any one of these nine basic requirements for the successful per formance of a heating plant is below par, it is enough to cause failure of a heating plant that otherwise would be a success.

' AMERICAN SOCIETY OF HEATING & VENTILAI1N6EN61NEEBS GMDEJ923] For steam heating, lj^-in. pipe is used almost exclusively, and the greenhouse man has found that where one line of 33^-in. pipe is required to produce a certain specified temperature with hot water as the heating medium, one line of 1%-m. steam pipe at 0-5 lb. pressure will do the same work.

American Society of Heating and Ventilating; Engineers Guide, 1924-25 TABLE 14.

American Society of Heating and Ventilating Engineers Guide, 1924-25 n - i vr rn nmm irt ni ionrlr-N American Society of Heating and Ventilating Engineers Guide, 1924-25 EQUALIZING RISER TEMPERATURE DROPS No matter how carefully riser or circuit sizes may be calculated, the limitations imposed by the necessity of using standard sizes of pipe and fittings will affect the results sought for in a heating system.

American Society of Heating and Ventilating Engineers Guide, 1924-25 the type; some of the stationary ventilators have smaller, and others have larger outlet area than some cowl ventilators of the same nominal size.

v Ventilators American-Larson Ventilating Co. 324 Fourth Ave., PITTSBURGH, PA.

ft American Society of Heating and Ventilating Engineers Guide, 1925-26 division point of two sections because the Section H-A conveys the heat for all three radiators, whereas Section 4-1 carries only the heat for Radiator 1.

American Society of Heating and Ventilating Engineers Guide, 1925-26 furnace when the fan is shut down.

American Society of Heating and Ventilating Engineers Guide, 1926-27 A grade, or pitch, of jHsth of an inch in 10 ft. is ample in either case. 1 There is a dearth of dependable data and rules for the sizing of mains with which to connect the coils with the boiler or boilers, owing to the fact that greenhouse heating uses more pipe for radiating surface with less head or elevation than is required or used with any other type of gravity heating.

American Society of Heating and Ventilating Engineers Guide, 1926-27 The boiler shall be connected with a short, direct smoke-pipe to a chimney flue of suitable size, height and construction to give proper draft.

American ofSociety Heating and Ventilating Engineers Guide, 1926-27 and allowing return mains to be run overhead.

American Society of Heating and Ventilating Engineers Guide, 1928 capacities of branches to risers and radiators are based upon past ex perience and the Laboratory's findings.

American Society of Heating and Ventilating Engineers Guide, 1928 QILLHAM, Walter E.,* (1917), (Treas. 1926; Council 1924-1926), Consulting Engr., (for mail), 409 Interstate Bldg., and 3427 Bellefontaine, Kansas City, Mo.

American Society of Heating and Ventilating Engineers Guide, 1929 d.

American Society of Heating and Ventilating Engineers Guide, 1929 TRAPS Traps ordinarily used in connection with heating and ventilating engineering may be divided into the following three types: (1) steam traps, (2) oil traps, (3) air traps.