9
For Canada, indoor installation is restricted to an enclosure
that is not occupied and does not directly communicate
with an occupied area. Refer to the latest edition of CAN/
CSA-B149 for specific requirements. Locate heater as
close as is practical to a chimney or gas vent. Heater
must always be vented to the outside. See section
"Vent
Piping" on page 12
for details. Minimum allowable
space is shown on the nameplate.
A
WARNING:
Indoor heaters require a drafthood that
must be connected to a vent pipe and properly vented to
the outside. Failure to follow this procedure can cause
fire or fatal carbon monoxide poisoning.
Outdoor and Indoor Stacks
The outdoor and indoor stacks are optional equipment
and do not come standard with the heater.
Refer to
installation instructions inside box for instructions on
how to install outdoor/indoor stack.
Model
Outdoor Stack
Indoor Stack
Part No
Part No.
207A
009834
009838
266L/267A
009835
009839
337A
009836
009840
399L/407A
009837
009841
Table D. Outdoor and Indoor Stack Kit Number
NOTE:
The outdoor drafthood kit does not require any
additional vent pipe for proper operation. This drafthood
functions as the vent termination.
Combustion and Ventilation Air
Indoor Units Only
The heater must have both combustion and ventilation
air. The minimum requirements are listed in the latest
edition of the National Fuel Gas Code (U.S. ANSI Z223.1
or Canada CAN/CSA-B149) and any local codes that
may have jurisdiction. The most common approach is
the "2-opening" method, with combustion air opening no
more than 12" from the floor and the ventilation opening
no more than 12" from the ceiling. For opening sizes using
this method, see below.
All Air from Inside the Building:
Each opening shall have a minimum net free area as
noted:
Model
Sq. in. (m
2
)
207A
200 (0.13)
266L/267A
266 (0.17)
337A
333 (0.21)
399L/407A
399 (0.26)
Table E. Opening Minimum Net Free Requirements -
Indoor Air
All Air from Outdoors:
When air is supplied directly from outside the building, each
opening shall have a minimum net free area as noted:
Model
Unrestricted
Opening
sq. in. (m
²
)
Typical Screened
or Louvered
Opening
sq. in. (m
²
)
Typical Screened
and Louvered
Opening
sq. in. (m
²
)
207A
50 (0.03)
75 (0.05)
100 (0.1)
266L/267A
67 (0.04)
101 (0.06)
134 (0.09)
337A
84 (0.05)
126 (0.08)
168 (0.11)
399L/407A
100 (0.06)
150 (0.1)
200 (0.13)
Table F. Opening Minimum Net Free Requirements -
Outdoor Air
A
CAUTION:
Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater. Such damage will not be covered by the warranty
INDOOR STACK KIT
(1) Drafthood, unpainted
(1) Adapter plate
(3) Mounting brackets (clips)
(3) Screws
(1) Instructions
Clips
OUTDOOR STACK KIT
(1) Outdoor stack, painted
(1) Adapter plate
(3) Mounting brackets (clips)
(1) Top panel cover
(2) 1-foot sections of metal tape
(3) Screws
(1) Instructions
Clips
Figure 5. Outdoor Stack Kit Components
Figure 6. Indoor Stack Kit Components
