USEFUL EQUIVALENTS	
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1 Imperial Gallon	=	1.2  U.S. Gallon
1 U.S. Gallon of Water	=	8.34 Pounds
1 U.S. Gallon 		=	231 cubic Inches
1 Litre			=	0.2641 U.S. Gallon
1 Cubic Foot of Water	=	62.4 Pounds
1 Cubic Metre		=	35.31 Cubic Feet
1 Pound per Square Inch	=	27.7 Inches of Water
1 Pound per Square Inch	=	2.036 Inches of Mercury
1 Cubic Foot of Air	=	0.076 Pounds (Std. Pressure and Temp.)
1 Pound of Air		=	13.1 Cubic Feet (Std. Pressure and Temp.)
1 cfh of Natural Gas	=	1000 BTU (approx.)