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COMBUSTION AND VENTILATION AIR
(Indoor Units Only)
The heater must have both combustion and ventilation air. Minimum requirements for net free air supply open-
ings are one opening that is 12 inches from the ceiling for ventilation, and one opening that is 12 inches from the
floor for combustion air as outlined in the latest edition of the National Fuel Gas Code, ANSI Z223.1(Canada-
CAN/CSA-B149) and any local codes that may have jurisdiction.
A. All Air From Inside The Building:
Each opening shall have a minimum net free area as noted:
B. 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.)
268
408
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the
heater and void the warranty.
VENT PIPING
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.
Vent piping the same size as the drafthood outlet is recommended, however, when the total vent height is at
least 10 ft (drafthood relief opening to vent terminal), the vent pipe size may be reduced as specified in Chapter
10 of the National Fuel Gas Code, ANSI Z223.1 (Canada - CAN/CSA-B149). As much as possible, avoid long
horizontal runs of vent pipe and too many elbows. If installation requires horizontal runs, the vent pipe must have
a minimum of 1/4 in. per ft rise and should be supported at not more than five foot intervals. Plumbers tape,
criss-crossed, will serve to space both horizontal and vertical piping. Gas vents supported only by the flashing
and extending above the roof more than five feet should be securely guyed or braced to withstand snow and
wind loads. We recommend use of insulated vent pipe spacers through the roofs and walls. Another option for
installation that requires horizontal runs is using the D-2 power vent kit option.
Power Vent Kit
120 VAC
Model
Part No.
268
010744
408
010745
For more information consult the D-2 Power Vent manual, (Catalog No. 6000.57.1).
The unit, when installed as directed, is capable of operating in applications such as through-the-wall venting and
reduced horizontal and vertical vent pipe sizes in new and current installations. The unit is factory-wired for 240
VAC, with capability of rewiring for 120 VAC.
For protection against rain or blockage by snow, the vent pipe must terminate with a vent cap which complies
with the local codes or, in the absence of such codes, to the latest edition of the National Fuel Gas Code, ANSI
Z223.1 (Canada - CAN/CSA-B149).
Model
Square Inches
268
266
67
100
The D-2 Power Vent oper-
ates with a positve vent stat-
ic pressure and with a vent
240 VAC
gas temperature that pre-
Part No.
vents excessive condensate
009832
production in the vent, and
as such, is a CATEGORY III
009833
appliance.
Model
Square Inches
408
399
Typical Screened or
Louvered Opening (sq. in.)
101
150
Optional Raypak D-2
Power Vent
16
Typical Screened and
Louvered Opening (sq. in.)
134
200
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