Weil-McLain Gold CGi Series 2 User Manual page 11

Boiler Manual
Figure 5 Air from outdoors — vertical ducts
Outside or ventilated attic
Each opening free area =
1 sq. inch per 4,000 Btuh
CGi
boiler
Other
appliances
MODEL
CGi
Ventilated
crawl space
71006
4. When combustion air is supplied to the boiler
space
directly from outside through horizontal
: Provide two permanent openings:
ducts (Figure 6)
• One air opening within 12 inches of floor.
• A second opening within 12 inches of ceiling.
Each opening must provide a minimum free area
of
1 square inch per 2,000 Btuh of input
appliances in room plus requirements for any
exhaust fans in room. The duct cross sectional area
must be no less than the required area of the
permanent openings.
Figure 6 Air from outdoors — horizontal
ducts
Each opening free area =
1 sq. inch per 2,000 Btuh
CGi
boiler
Other
appliances
CGi MODEL
71007
Part Number 550-110-710/0200
Special considerations
Tight construction
ANSI Z223.1 defines unusually tight construction
where:
a. Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor retarder
with a rating of 1 perm or less with openings
gasketed, and . . .
b. Weather-stripping has been added on openable
windows and doors, and . . .
— or —
12"
c. Caulking or sealants are applied to areas such as
joints around windows and door frames, between
sole plates and floors, between wall-ceiling joints,
between wall panels, at penetrations for plumbing,
electrical, and gas lines, and in other openings.
For buildings with such construction, provide air
openings into the building from outside, sized per the
appropriate case in
inside air for combustion and ventilation.
of all
Exhaust fans and air movers
The appliance space must never be under a negative
pressure, even if the appliance(s) are installed as direct
vent. Always provide air openings sized not only to
the dimensions required for the firing rate of all
appliances, but also to handle the air movement rate of
the exhaust fans or air movers using air from the
building or space.
0 to 12"
0 to 12"
if appliances are to use
Figure 4
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