Section 3 — Stack and Intake Vent Sizing and Installation
3-12 Part No. 750-363
2. The openings must be linked directly (Figure 3-4) or by
ducts (Figure 3-5) with the outdoors.
3. Each opening must have a minimum free area of one
square inch per 4,000 Btu per hour of total input rating
of all equipment in the room, when the opening is directly
linked to the outdoors or through vertical ducts.
4. The minimum free area required for horizontal ducts is
one square inch per 2,000 Btu per hour of total input
rating of all the equipment in the room.
Figure 3-4 Two Opening Outside Wall Method
GAS
VENT
WATER
HEATER
GAS
VENT
INTERIOR WALL
FRESH AIR OPENING
FRESH AIR OPENING
12" MINIMUM
12" MINIMUM
CLEARFIRE
BOILER
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