Freestyle 2 Series - Boiler Room Air Openings

Part number 550-142-950/0122
20
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
9 Boiler room air openings
Figure 23 Combustion and ventilation air openings for FreeStyle
®
Direct Vent installations. Provisions for combustion
and ventilation air to be n accordance with the section “Air for Combustion and Ventilation,” of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 - latest edition, or applicable provisions of the local building codes.
e FreeStyle
®
boiler CANNOT be in the same space with other appliances if clearances around the FreeStyle ® are
less than the recommended service clearances shown in Figure1,page5.
Air openings
e required air opening sizes below are FREE AREA,
aer reduction for louver obstruction. Note the ex-
ception below for large spaces.
FreeStyle
®
boiler
WITH other
appliances in room
FreeStyle
®
boiler
WITHOUT other
appliances in room
TWO openings, each at least:
1 square inch per 1,000 Btuh
of all other appliances in the room
(Unless specied 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 5.
Provide openings ONLY as shown
in Figure 1, page 5.
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 specied 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 specied 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 specied otherwise by ap-
pliance manufacturer)
** NOTICE:
Requirements for using the SINGLE air opening
option.
A single combustion air opening can be used for cases b, c or d above ( FreeStyle
®
with other appliances in room only), sized as listed, provided that:
• The single opening must communicate directly to the outdoors or to a space that
communicates directly with outdoors (NOT to an interior space).
• The top of the opening must be within 12 inches of the ceiling.
• 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.
SPECIAL EXCEPTION FOR LARGE SPACES
(FreeStyle
®
WITH other appliances in room
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.