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Knock Outs
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in
personal injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear appropriate clothing, safety
glasses and gloves when handling parts and
servicing furnaces.
Use a hammer and screwdriver to strike a sharp blow (see
Figure 5) directly to the knockout tie points or use a hammer in the
upper left corner of the desired knockout. Remove any burrs and
sharp edges.
Combustion & Ventilation Air
For Single Pipe Installation
(Non−Direct Vent)
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning may result in
personal injury or death.
Provide adequate combustion and ventilation air.
Use
methods
described
combustion and ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or
openings for supplying combustion and ventilation air must comply
with National Fuel Gas Code, NFPA54/ANSI Z223.1, 2009 (or
current edition) and applicable provisions of local building codes.
Note: The Combustion & Ventilation Air Section in this document,
uses tables and information from the ANSI Z223.1/NFPA
54. For use in Canada, use CSA B149.1 for this information.
1.
Section 9.3, Air for Combustion and Ventilation, of the
National Fuel Gas Code, National Fuel Gas Code (NFGC),
ANSI Z223.1/NFPA 54−2009 in the U.S.,
2.
Sections 8.2, 8.3, 8.5, 8.6, 8.7, and 8.8 of National Standard of
Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1−05 in Canada,
3.
Applicable provisions of the local building code.
This furnace can NOT be common vented or connected to any type
B, BW or L vent or vent connector, nor to any portion of a
factory−built or masonry chimney. Multistory venting is NOT
permitted. If this furnace is replacing a previously common-vented
furnace, it may be necessary to resize the existing vent and
chimney to prevent oversizing problems for the other remaining
appliance(s). See "Venting and Combustion Air Check" in this
section. This furnace MUST be vented to the outside.
When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting
And Combustion Air Check in "Gas Vent Installation" Section in this
manual.
440 01 2024 04
here
to
provide
Specifications are subject to change without notice.
Hammer and Screwdriver Used
Figure 5
for Knockout
NOTE: If a knockout does not come out after two sharp blows, pull
and snip as needed to remove the knockout.
Outdoor Combustion Air Method
A space having less than 50 cubic feet per 1,000 BTUH (4.8 cubic
meters per kW) input rating for all gas appliances installed in the
space requires outdoor air for combustion and ventilation.
Air Openings and Connecting Ducts
1.
Total input rating for all non direct vent gas appliances
MUST be considered when determining free area of
openings.
2.
Connect ducts or openings directly to outside.
3.
When screens are used to cover openings, they MUST be
1
no less than
/
" (6.4mm) mesh.
4
4.
The minimum dimension of rectangular air ducts MUST
NOT be less than 3" (76.2mm).
5.
When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver,
assume a 20% free area for wood and 60% for metal.
Confined Space Installation
NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH (4.8 cubic meters per kW) input rating
for all gas appliances installed in the area.
Requirements
1.
Provide confined space with sufficient air for proper
combustion and ventilation of flue gases using horizontal or
vertical ducts or openings.
2.
Figure 6 illustrate how to provide combustion and
ventilation air. A minimum of two permanent openings, one
inlet and one outlet, are required.
a.
One opening MUST commence within 12" (304.8mm) of
the floor and the second opening MUST commence
within 12" (304.8mm) of the ceiling.
b.
Size openings and ducts per Table 1.
c.
Horizontal duct openings require 1 square inch of free
area per 2,000 BTUH (11 cm
all gas appliances in the space (see Table 1).
d.
Vertical
duct
openings
communicating with the outdoors require 1 square inch
of free area per 4,000 BTUH (5.5 cm
input of all gas appliances in the space (see Table 1).
25-40-06
2
/kW) of combined input for
or
openings
directly
2
/kW) for combined
11
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