5
CLEARANCES TO COMBUSTIBLE MATERIALS
This furnace is Designed Certified by CSA International for the minimum clearances to combustible
material listed in Table 6. See the furnace name plate, located inside the furnace cabinet, for specific
model number and clearance information.
Table 2. Minimum Clearances to Combustible Materials
‡
24 inches is the minimum clearance for servicing.
36 inches is the recommended clearance for service.
IMPORTANT NOTE
The Commonwealth of Massachusetts re-
quires compliance with regulation 248 CMR
4.00 and 5.00 for installation of through – the –
wall vented gas appliances as follows:
(a) For direct-vent appliances, mechanical-
vent heating appliances or domestic hot
water equipment, where the bottom of the
vent terminal and the air intake is installed
below four feet above grade the following
requirements must be satisfied:
1. If there is not one already present, on
each floor level where there are
bedroom(s), a carbon monoxide de-
tector and alarm shall be placed in the
living area outside the bedroom(s). The
carbon monoxide detector shall com-
ply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be
located in the room that houses the
appliance or equipment and shall:
a. Be powered by the same electrical
circuit as the appliance or equipment
such that only one service switch
services both the appliance and the
carbon monoxide detector;
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards and
comply with NFPA 720 (2005 Edi-
tion); and
d. Have been approved and listed by a
Nationally Recognized Testing Lab-
oratory as recognized under 527
CMR.
3. A Product-approved vent terminal must
be used, and if applicable, a Product-
approved air intake must be used. In-
stallation shall be in strict compliance
with the manufacturer’s instructions. A
copy of the installation instructions shall
remain with the appliance or equipment
at the completion of the installation.
4. A metal or plastic identification plate
shall be mounted at the exterior of the
building, four feet directly above the
location of vent terminal. The plate shall
be of sufficient size to be easily read
from a distance of eight feet away, and
read “Gas Vent Directly Below”.
(b) For direct-vent appliances, mechanical-
vent heating appliances or domestic hot
water equipment where the bottom of the
vent terminal and the air intake is installed
above four feet above grade the following
requirements must be satisfied:
1. If there is not one already present, on
each floor level where there are
bedroom(s), a carbon monoxide de-
tector and alarm shall be placed in the
living area outside the bedroom(s). The
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIAL
High Fire
Cabinet
Minimum Clearances (Inches)
Rated Input
Width
(Btuh)
(Inches)
Side
Vent
Back
Top
Front
60,000
19 3/4
0
0
0
1
1
‡
80,000
19 3/4
0
0
0
1
1
‡
100,000
19 3/4
0
0
0
1
1
‡
120,000
22 1/2
0
0
0
1
1
‡
