Section 3 — Stack and Intake Vent Sizing and Installation
Part No. 750-263 3-19
• Area required: Area = cfm/fpm = 1,080/250 = 4.32
square feet total.
• Area/Opening: 4.32/2 = 2.16 sq-ft/opening (2 required).
Notice
Consult local codes, which may supersede these requirements.
Direct Vent CombustionIf combustion air will be drawn directly from the outside by means of
a duct connected to the burner air intake, use the following as a
guide:
1. Install combustion air vent (direct vent combustion) in
accordance with the boiler's Operating and Maintenance
manual.
2. Provide for adequate ventilation of the boiler room or
mechanical equipment room.
3. In cold climates, and to mitigate potential freeze-up of the intake
pipe, it is highly recommended that a motorized sealed damper
be used to prevent the circulation of cold air through the boiler
during non-operating hours.
4. Refer to Figure 3-2 and Figure 3-4 for suggested piping of direct
vent combustion installations. Figure 3-9 shows the optional
direct vent combustion kit providing easy adaptation of the
contractor supplied air duct to boiler connection. Refer to Table
3-2 for sizing the direct vent combustion air pipe.
Figure 3-9. Optional Direct Vent Combustion Kit
FAN/BLOWER
VENTURI
AIR SUPPLY LINE
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