Sizing Vented Gas Heaters
GORMAN INDUSTRIES INC.
COZY comfort . . . . . . with our Warmest Regards!
505-247-1596 Toll Free is 877-247-1596

SELECTION PROCESS:

Step 1: Measure Room:
Length_______ x Width_______ x Ceiling Height_______ =_______Cubic Ft.

Step 2: Determine Insulation Factor (1), (2), or (3). (See below)

Step 3: Select Temperature Zone from map below.

Step 4: Multiply:
Temperature Zone/Insulation Factor Digit ___ x  Total Cubic Ft. _______ = _______ Btu Input Required

INSULATION FACTORS:

1) Insulation in ceiling and walls with storm doors and windows.

2) Insulation in ceiling, none in walls, with weather stripping.

3) Little or no insulation in ceilings or walls, unusual exposure, large glass areas.

Temperature Zones -40°F -30°F -20°F -10°F 0°F 10°F 20°F 30°F
Maximum Insulation Factor (1) 11 10 9 8 7 6 5 4
Average Insulation Factor (2) 18 16 14 12 10 1/2 9 7 1/2 6
Poor Insulation Factor (3) 24 21 19 17 15 13 11 9

THE ABOVE GUIDELINES ARE FOR VENTED PRODUCTS ONLY
(NOT FOR VENT-FREE UNITS).

TEMPERATURE ZONES
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