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Figure26 Combustion and ventilation air openings for Evergreen
®
Direct Vent installations. Provisions for combustion
and ventilation air to be in accordance with the section “Air for Combustion and Ventilation,” of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, or applicable provisions of the local building codes.
Part number 550-100-211/0122
– 24 –
e Evergreen
®
boiler CANNOT be in the same space with other appliances if clearances around the Evergreen
®
are less than the recommended service clearances shown in Figure1,page7.
e required air opening sizes below are FREE AREA,
aer reduction for louver obstruction. Note the ex-
ception below for large spaces.
Evergre en
®
Evergre en
®
TWO openings, each at least:
1 square inch per 1,000 Btuh
of all other appliances in the room
(Unless specied otherwise by ap-
pliance manufacturer)
NO openings are required if the boiler
installation provides at least the rec-
ommended service clearances shown
in Figure 1, page 7.
If the space is smaller than Fig-
ure 1, page 7, provide openings
ONLY as shown in Figure 2, page 7.
Each opening must have a free
area no less than 1 square inch per
1,000 Btuh input of the boiler.
TWO openings, each at least:
1 square inch per 4,000 Btuh
of all other appliances in the room
— OR —
ONE opening **, each at least:
1 square inch per 3,000 Btuh
of all other appliances in the room
(Unless specied otherwise by ap-
pliance manufacturer)
TWO openings, each at least:
1 square inch per 4,000 Btuh
of all other appliances in the room
— OR —
ONE opening **, each at least:
1 square inch per 3,000 Btuh
of all other appliances in the room
(Unless specied otherwise by ap-
pliance manufacturer)
TWO openings, each at least:
1 square inch per 2,000 Btuh
of all other appliances in the room
— OR —
ONE opening **, each at least:
1 square inch per 3,000 Btuh
of all other appliances in the room
(Unless specied otherwise by ap-
pliance manufacturer)
**NOTICE:
RequirementsforusingtheSINGLEairopening
option.
A single combustion air opening can be used for cases b, c, or d above (Evergreen
®
with other appliances in room only), sized as listed, provided that:
y The single opening must communicate directly to the outdoors or to a space that
communicates directly with outdoors (NOT to an interior space).
y The top of the opening must be within 12 inches of the ceiling.
y The free area of the opening must be at least equal to the sum of the areas of all
equipment vent connectors in the space.
SPECIALEXCEPTIONFORLARGESPACES
(EvergreenWITHotherappliancesinroom
only):
NO combustion air openings are needed if the boiler (and other appliances) are installed
in a space with a volume NO LESS than 50 cubic feet per 1,000 Btuh of all appliances
in the space. That is, total the input of all appliances in MBH (1,000’s of Btuh), then
multiply this total times 50. The building MUST NOT be of tight construction.
Example: For a total input of 500 MBH (500,000 Btuh), the minimum volume would
be 50 x 500 = 25,000 cubic feet.
220 /29 9/3 00 /39 9
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