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MFC Series Boiler Vent and Combustion Air Guide
Figure 4: All Combustion Air from Outdoors - Through Ventilated Attic
•
When communicating with the outdoors through horizontal ducts, each opening shall have a
minimum free area of 1 inch
appliances in the space (see Figure 5).
Figure 5: All Combustion Air from Outdoors through Horizontal Ducts
TAG-0080_OG • GF-148-V •
2
per 2,000 BTU/hr. (1100 mm
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3/29/2023
33
2
/kW) of total input rating of all
OUTDOOR OPENINGS
TO HORIZONAL AIR
DUCTS
Page 8 of
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