Heating Systems Burners, ou Burner Co.

Heating Systems. stm Sarco Company, Inc.

Insulation Kimberly-Clark Corporation Neenah, Wisconsin New York 17, N.

Air Conditioning and Heating Piping Copper and Brass The American Brass Company General Offices: Waterbury 20, Conn.

Aerofin Corporation Air System Equipment stSf^fnrfer Aerofin Corporation Air System Equipment Heat Transfer Surface Fig.

& M!

PLAINTIFF'S EXHIBIT 4 ,-Zod.e-2-=2c-2B;i.6a. 2 j 2 jg a jm 2. dd se -s *ia s **: s^3 SzhS^hzSzE^hS .

PLAINTIFF'S EXHIBIT * < iJrrw iai -- Ion n* -Mavvj i.i.k C 'iouiduation- tl.

X ~~-- '' Air System Equipment Iiow "wSS"8 --' = Morrison Products, Inc.

Bends, Coils, Fittings Expansum Joints American District Steam Company.

/ Controls and Instruments X- Detroit Regulator Co. 1742 Rivard Street Detroit 7, Michigan LOW PRESSURE GAS REGULATORS Pacific Coast Distributor; PACIFIC SCIENTIFIC CO.

Insulation Armstrong Cork Company Building Materials Division Lancaster ujQj Pennsylvania Offices Albany Allentown Anchorage Atlanta Baltimore Bilungs Birmingham Boston Buffalo Charlotte Chicago Cincinnati Cleveland Columbus Dallas Denver Detroit Evansville Fairbanks Harrisburg Hartford Houston Indianapolis Jacksonville Kansas Citt Los Angeles Louisville Memphis Distributors Milwaukee Minneapous New Orleans New York Omaha Philadelphia Pittsburgh Portland Providence Richmond Rochester St.

1 I- Itj . j* ; ' i\: !

where '; (?

Air Duct Design .705 the air, and are therefore conveniently expressed as a fraction of the velocity head: and for standard air hr = c 2g (4) where hr = dynamic pressure loss, feet of fluid flowing.