GF
-
5050
TAG-0043_0C
Venting and Combustion Air Guide
Page
158
of
200
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph.: 800-526-0288
07/21/11
2 COMBUSTION AIR SYSTEM
AIR OPENINGS TO COMBUSTION AREA MUST NOT BE OBSTRUCTED.
USING THE
FOLLOWING CHART, ADEQUATE COMBUSTION AIR CAN BE MAINTAINED.
2.1 COMBUSTION AIR REQUIREMENTS
The following tabular listing shows the minimum required air openings in square inches (square
centimeters) freely communicating with the outdoors for boiler/heater room combustion and ventilation
air for each unit. For multiple unit installations, sum the openings for the specific heater sizes.
Minimum Required Air Openings Freely Communicating With the Outdoors
For Boiler/Heater Room Combustion & Ventilation Air
Model
No
.
Two Sealed Combustion or
Vertical Ducts Each having an
opening in sq. in. (sq.cm) of:
Two Horizontal Ducts Each
having an opening in square
inches of
Single Permanent
Opening
INN600
152 in
2
(980 cm
2
)
304 in
2
(1961 cm
2
)
202 (1303)
INN800
190 in
2
(1226 cm
2
)
380 in
2
(2451 cm
2
)
253 (1632)
INN1060
266 in
2
(1716 cm
2
)
532 in
2
(3431 cm
2
)
354 (2283)
1. The combustion air must be free of chlorine, halogenated hydrocarbons or other chemicals that
can become hazardous when used in gas-fired equipment. Common sources of these
compounds are swimming pools, degreasing compounds, plastic processing, and refrigerants.
Whenever the environment contains these types of chemicals, combustion air MUST be
supplied from a clean area outdoors for the protection and longevity of the equipment and
warranty validation.
2. Ventilation of the boiler/heater room must be adequate enough to provide sufficient air to
properly support combustion.
3. When combustion air is brought from outside the building, the boiler/heater room shall be
provided with two permanent openings, one commencing 12 inches from the top and one
commencing within 12 inches from the bottom of the room (see Figures 2 and 3). The openings
shall communicate directly, or by ducts, freely with the outdoors. One of the following methods
must be made to provide adequate air for ventilation and combustion.
a. When directly communicating with the outdoors, each opening shall have a minimum free
area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the
room.
b. When communicating with the outdoors by means of vertical ducts, each opening shall
have a minimum free area of 1 square inch per 4,000 BTU per total input rating of all
appliances in the room.
c. If horizontal ducts are used, each opening and duct shall have a minimum free area of 1
square inch per 2,000 BTU per hour of total input rating of all appliances in the room.
•
Non-motorized louvers and grilles must be fixed in an open position.
•
Minimum screens mesh size shall not be smaller than ¼ inch mesh.
Pg 6 of 22
