K&fotill* Research April 23, 1948 File 45751-R** L U.

January 10, 1941 Mr.

Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL LEGAL - - - decision* and trends MARCH. 1949 (Vol. 13.

FRANK J.

KCfifBEV t MflTTIJOW COMPANY AIR MAIL MANUFACTURIRt Of AliUTOI AND MAONIJIA PRODUCTS SINC1 l73 A M I l (Ri PlAHlUVBNIA .

Mr. ff.W.P.

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 The maximum rating as defined in the preceding paragraph shall be based upon com bustion of Pennsylvania anthracite, having, the following approximate analysis: Volatile matter 3.5 to 9 per cent; ash content not to exceed 15 per cent; sulphur content Under 1.5 per cent; ash fusing temperature 2750 F, or above (volatile, ash and sulphur content on dry basis in accordance with A .S.T.M. method D271-33); Btu content 12,000 or above; properly sized as follows: A No. 1 buckwheat should pass through a round mesh screen having jKe in. holes and over a similar screen having Y\c in. holes.

HEATING VENTILATING AIR CONDITIONING CUIDE 1940 Conversion Burners Residence heating with gas through the use of conversion burners in stalled in coal-designed boilers and furnaces represents a common type of gas-fired house heating system.

V HEATING VENTILATING AIR CONDITIONING GUIDE 1940 effected by use of- direct-acting radiator valves having a thermostatic element at the valve, or near to it.

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 connection for intake water should be placed as far below the surface as possible, and at as great a distance from the discharge as practicable.

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 MERRILL, Frank A.

HEATING VENTILATING AIR CONDITIONING CUIDE 1941 size and flow.

HEATING VENTILATING AIR CONDITIONING GUIDE 1941 Table 2.

HEATINC VENTILATING AIR CONDITIONING GUIDE 1941 room thermostat regulates the supply of steam to the unit through a control valve in the steam supply line and the unit heater motor operation is manually controlled.

HEATING VENTILATING AIR CONDITIONING GUIDE 1941 carbon dioxide.