Weil-McLain SVF 1500 Manual page 39

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
DIRECT VENT — Boiler room air openings
Figure 33
MINIMUM combustion air openings for direct vent applications —
Air openings
The required air opening sizes below are FREE AREA,
after reduction for louver obstruction. Note the exception
below for large spaces.
ing option.
Part number 550-100-250/0819
SVF
TM boiler
WITH other
appliances in room
TWO
openings, each at least:
1 1,000
square inch per
of all other appliances in the room,
but not less than 100 in
TWO
openings, each at least:
1 2,000
square inch per
of all other appliances in the room
— OR —
ONE
opening **, each at least:
1 3,000
square inch per
of all other appliances in the room
TWO
openings, each at least:
1 2,000
square inch per
of all other appliances in the room
— OR —
ONE
opening **, each at least:
1 3,000
square inch per
of all other appliances in the room
TWO
openings, each at least:
1 2,000
square inch per
of all other appliances in the room
— OR —
ONE
opening **, each at least:
1 3,000
square inch per
of all other appliances in the room
A single combustion air opening can be used for cases b, c or d above, 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 equip-
ment vent connectors in the space.
NO combustion air openings are needed when 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 1500 MBH (1,500,000 Btuh) and an 8-foot ceiling height, the
minimum volume would be 50 x 1500 = 74,000 cubic feet.
(continued)
SVF
TM
WITHOUT other
appliances in room
NO
openings are required if the boiler
installation provides at least the Rec-
ommended service clearances shown
on page 7.
Btuh
If the space is smaller, provide ONE
2
.
opening to a larger room with at least
1
square inch per
TM
SVF
of boiler input.
NO
openings are required if the boiler
installation provides at least the Rec-
Btuh ommended service clearances shown
on page 7.
If the space is smaller, provide ONE
opening to a larger room with at least
Btuh
1
square inch per
TM
SVF
of boiler input.
NO
openings are required if the boiler
installation provides at least the Rec-
Btuh ommended service clearances shown
on page 7.
If the space is smaller, provide ONE
opening to a larger room with at least
Btuh
1
square inch per
TM
SVF
of boiler input.
NO
openings are required if the boiler
installation provides at least the Rec-
Btuh ommended service clearances shown
on page 7.
If the space is smaller, provide ONE
opening to a larger room with at least
Btuh
1
square inch per
TM
SVF
of boiler input.
boiler
3,000
Btuh
3,000
Btuh
3,000
Btuh
3,000
Btuh
39