VENT PIPING
When properly installed outdoors, only the outdoor stackless top (provided) is required. If installed indoors, a
drafthood is required, connected to a CATEGORY I vent system per the National Fuel Gas Code and local
requirements. (List venting categories; see 1000.501L pg 26.) 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.
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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:
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.
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the
heater and void the warranty.
A. All Air From Inside The Building:
Each opening shall have a minimum net free area as noted:
Model Square Inches Model Square Inches
206/207 200 336/337 333
266/267 266 406/407 399
Model
Unrestricted Opening (sq. in.)
Typical Screened or
Louvered Opening (sq. in.)
Typical Screened and
Louvered Opening (sq. in.)
206/207 50 75 100
266/267 67 101 134
336/337 84 126 168
406/407 100 150 200
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.
Power Vent Kit
Model
120 VAC
Part No.
240 VAC
Part No.
206/207 010744 009832
266/267 010744 009832
336/337 010745 009833
406/407 010745 009833
Optional Raypak D-2
Power Vent
For more information consult the D-2 Power Vent manual, (Catalog No. 6000.57.1).
The D-2 Power Vent oper-
ates with a positve vent stat-
ic pressure and with a vent
gas temperature that pre-
vents excessive condensate
production in the vent, and
as such, is a CATEGORY III
appliance.
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