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1
Determine unit location
Figure 1-3_Outside Combustion Air - Single Opening
Two Openings
The combustion air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm
must locate this opening within 12" (30 cm) of the bottom of the
enclosure (see FIG. 1-4).
The ventilation air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm
must locate this opening within 12" (30 cm) of the top of the
enclosure.
Figure 1-4_Outside Combustion Air - Two Openings
2. Outside Combustion Air, Using Ducts
You can direct outside combustion air to this unit using two air
ducts to deliver the air to the equipment room (see FIG. 1-4).
Each of the two openings must have a minimum free area of one
square inch per 2000 Btu input (11cm
3. Combustion Air from Interior Space
You can direct combustion air to this unit using air from an
adjoining interior space. You must provide two openings from
the equipment room to the adjoining room (see FIG. 1-5).
Each of the two openings must have a net free area of one square
inch per 1000 Btu input (22cm
square inches (645cm
IMG00579
per kW). You
2
2
per kW). You
Figure 1-5_Combustion Air from Interior Space
IMG00580
Installation & Operation Manual
per kW).
2
2
per kW), but not less than 100
).
2
IMG00581
11
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