INSTALLATION
The following formula can be used to determine the maximum heater rating per the definition of unconfined space:
BTU/HR = (L1+L2) Ft x (W) Ft x (H) Ft x 1000
50
Consider two connecting rooms with an open area between,
with the following dimensions:(See Fig. 2, Example) |
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| H (8') | |
50 |
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L2 (12') |
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=52800 BTU/HR |
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| L1 | W (12') |
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If there were a door between the two rooms the calculation |
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would be based only on the room with the heater. |
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50 | FIGURE 2. | |
=29760 BTU/HR | ||
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WARNING WARNING WARNING
When installing the appliance directly on carpeting, tile or other combustible material, other than wood flooring, the appliance must be installed on a metal or wood panel extending the full width and depth of the appliance.
If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1, Section 5.3, or applicable local codes.
Ensure the minimum clearances shown in FIGURE 3 are maintained for accessibility for purposes of servicing and proper operation. Left and right clearances are determined when facing the front of the heater.
36"
8"
8"
42"
4"
FIGURE 3. Minimum Clearances
Maintaintheseclearancesto ensure adequate space around air opening for proper operation.
Minimum clearances to combustibles:
Top of heater | 36" |
Sides of heater | 8" |
Front of heater | 42" |
Rear of heater | 4" |
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