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B. All Air From Outdoors:
When air is supplied directly from outside of build-
ing, 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/CGA-B149.1 and B149.2) 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 Square Inches
206/207 50
266/267 67
336/337 84
406/407 100
VENT PIPING
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/CGA-B149.1 and B149.2). As much as pos-
sible, 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 inter-
vals. Plumbers tape, criss-crossed, will serve to space both horizontal and vertical piping. Gas vents support-
ed 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.
The power vent assembly is a fan-assisted combustion system designed for application to models 206-407. 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/CGA-B149.1 and B149.2).
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 Part No.
206/207 009832
266/267 009832
336/337 009833
406/407 009833
Fig.# 9469
Optional Raypak D-2
Power Vent
For more information consult the D-2 Power Vent manual, (Catalog No. 6000.57.1).