Combustion Air From Within The Building - Watts AERCO MFC Series Pre-Installation Application Manual

MFC Series Boiler Vent and Combustion Air Guide
In these situations, AERCO recommends that a disposable air intake filter be installed,
temporarily, above the boiler combustion air inlet. Air filters may be required year-round in
instances in which dust or debris can enter the combustion air tube. Consult the boiler Operations
and Maintenance Manual for details.
Combustion air temperatures as low as -30°F can be used without affecting the integrity of the
equipment; however, the combustion settings may require adjustment to compensate for site
conditions.

4.1 Combustion Air from WITHIN the Building

Where combustion air will originate from within the building, air must be provided to the equipment
room from two permanent openings to an interior room (or rooms). Openings connecting indoor
spaces shall be sized and located in accordance with the following:
•
Each opening shall have a minimum free area of 1 inch
2
mm /kW) of total input rating of all appliances in the space, but not less than 100 inch
2
(0.06 m ).
•
One opening shall commence within 12 inches (300 mm) of the top of the enclosure, and
one opening shall commence within 12 inches (300 mm) of the bottom. (See Figure 2).
•
The minimum dimension of air openings shall be not less than 3 inches (80 mm).
Figure 2: All Combustion Air from Adjacent Indoor Spaces through Indoor
TAG-0080_OG • GF-148-V •
Combustion Air Openings
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3/29/2023
33
2
per 1,000 BTU/hr (2,200
INDOOR
COMBUSTION
AIR OPENINGS
2
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