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Engineering Equivalents Table

1,000 sq. ft. E.D.R.=240,000 BTU per hr.
1,000 sq. ft. E.D.R.=247 lbs. Water Evap. per hr.
1,000 sq. ft. E.D.R.=1/2 gal. Water Evap. per min.
1 sq. ft. E.D.R.=240 BTU per hr. (Steam)
1 sq. ft. E.D.R.=150 BTU per hr. (Hot Water)
1 sq. ft. E.D.R.=1/4 lb. Water Evap. per hr.
1 Boiler HP.=33,475 BTU per hr.
1 Boiler HP.=34.5 lbs. Water Evap. Per hr. (at 212 degrees F)
1 Boiler HP.=.07 gal. Water Evap. per min.
1 Boiler HP.=140 sq. ft. E.D.R. (Steam)
1 Boiler HP.=222 sq. ft. E.D.R. (Hot Water)
1 lb. P.S.I.=2.31 ft. of Water
1 lb. P.S.I.=2.04 ins. of Mercury
1 lb. P.S.I.=.068 Atmosphere
1 ft. of Water=.433 lbs. P.S.I.
1 ft. of Water=.882 ins. of Mercury
1 ft. of Water=.029 Atmosphere