PLAINTIFF'S EXHIBIT BiiS TWALL GYPSUM COMPANY ftrdmore October 27g 1958 Paoli Laboratory 1-Sr* J.

Radiation (Concealed Gravity Typ^ Heintz Manufacturing Company i Front Street and Olney Avenue Philadelphia p MANUFACTURERS OF CABINET AND CONCEALED RADIATORS ^ The Heintz Radiator Unit is built of tubing, fins and headers.

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American Society of Heating and Ventilating Engineers Guide, 1932 Table 10.

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American Society of Heating and Ventilating Engineers Guide, 1934 is necessary to maintain a pressure of about 0.1 in. of water in the room or space to be ventilated or conditioned.

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..

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