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To operate properly and safely this boiler/water heater
requires a continuous supply of air for combustion.
NEVER store objects on or around the boiler/water
heater!
CAUTION: Combustion air contaminated with
fluorocarbons or other halogenated compounds
such as cleaning solvents and refrigerants will
result in the formation of acids in the combustion
chamber. These acids will cause premature failure
of the boiler/water heater voiding the warranty!
CAUTION: If the boiler/water heater is operated while
the building is under construction it MUST be
protected from wood, concrete, sheet rock and other
types of dust. Failure to properly protect the unit
from construction dust will damage the unit voiding
the warranty!
All Air From Inside The Building
If the boiler/water heater is to be located in a confined
space, minimum clearances listed in Table 1 must be
maintained between the boiler/water heater and any
combustible construction. When installed in a confined
space, Figures 1 and 2, two permanent openings
communicating with an additional room(s) are required.
The combined volume of these spaces must have
sufficient volume to meet the criteria for an unconfined
space. The total air requirements of all gas utilization
equipment, fireplaces, wood stoves or any type of
exhaust fan must be considered when making this
determination. Each opening must have a minimum free
area of 1 in
2
/1000 Btu/hr, 2200 mm
total input rating of ALL gas utilization equipment in
the confined area. Each opening must be no less than
2
, 64,516 mm
2
100 in
in size. The upper opening must
be within 12 in, 305 mm of, but not less than 3 in,
76 mm from, the top of the enclosure. The bottom
opening must be within 12 in, 305 mm of, but not less
than 3 in, 76 mm from, the bottom of the enclosure.
All Air From Outside The Building
When installed in a confined space two permanent
openings communicating directly with, or by ducts to,
the outdoors or spaces that freely communicate with the
outdoors must be present. The upper opening must be
within 12 in, 305 mm of, but not less than 3 in, 76 mm
from, the top of the enclosure. The bottom opening must
be within 12 in, 305 mm of, but not less than 3 in,
76 mm from, the bottom of the enclosure.
Where directly communicating with the outdoors
or communicating with the outdoors through vertical
ducts, each opening shall have a minimum free area
2
of 1 in
/4000 Btu/hr, 550 mm
rating of all of the equipment in the enclosure.
SPECTRUM INSTALLATION AND OPERATING INSTRUCTIONS
2
/kW based on the
2
/kW of the total input
Where communicating with the outdoors through
horizontal ducts, each opening shall have a minimum
free area of 1 in
2
/2000 Btu/hr, 1100 mm
input rating of all of the equipment in the enclosure.
When louvers and screens are used, they must have
the same cross-sectional area as the free area of the
opening to which they connect.
When calculating the free area necessary to meet the
make-up air requirements of the enclosure,
consideration must be given to the blockage effects of
louvers, grills and screens. Screens must have a
minimum mesh size of 1/4 in, 6.4mm . If the free area
through a louver or grill is not known, ducts should be
sized per Table 3.
Canadian installations must comply with CSA B149.1
when air supply is provided by natural air flow from the
outdoors for natural draft , partial fan-assisted, fan-
assisted, or power draft-assisted burners , there shall
be a permanent air supply opening(s) having a cross-
sectional area of not less than 1 in
(310 mm
2
per kW) up to and including 1 million Btuh,
2
plus 1 in
per 14,000 Btuh (155 mm
of 1 million Btuh.
Table 3 - Make-up Air Louver Sizing
Required Cross Sectional Area
1/4 in 6.4 mm
Input
(MBH)
Wire Screen
in
2
cm
2
161
100
25
150
37
858
200
50
322
250
62
400
300
75
484
561
350
87
400
100
645
CHIMNEY & VENT PIPE
CONNECTIONS
WARNING: The vent installation must be in
accordance with Part 7, Venting of Equipment,
of the latest revision of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or applicable
provisions of the local building codes. Canadian
installations must comply with CSA B149.1 or .2
Installation Code. Improper venting can result in
excessive levels of carbon monoxide which can
result in severe personal injury or death!
2
/kW of the total
2
per 7,000 Btuh
2
per kW) in excess
75% Free Area
25% Free Area
Metal Louvers
Wooden Louvers
in
2
cm
2
in
2
213
33
100
50
322
150
67
432
200
83
535
250
100
645
300
754
117
350
133
858
400
cm
2
645
967
1290
1612
1934
2257
2579
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