23
above the roof more than 5 ft should be securely
guyed or braced to withstand snow and wind loads.
The air inlet opening MUST be installed 1 ft above the
roof line or above normal snow levels that might ob-
struct combustion air flow. This dimension is critical to
the correct operation of the heater and venting system
and reduces the chance of blockage from snow. The
vent cap must have a minimum 3 ft vertical clearance
from the air inlet opening.
Use only the special gas vent pipes listed for use with
Category III gas burning heaters, such as the AL29-4C
stainless steel vents offered by Selkirk Inc. (1-800-
1) DISASSEMBLE
STACKLESS TOP
AND FLUE EXHAUST
COVER
2) SWAP LOCATIONS OF
STACKLESS TOP
AND FLUE EXHAUST
COVER
3) COMPLETED
REASSEMBLY
Outdoor Venting - Conversion to Stackless Rear Exhaust
992-VENT or 1-800-992-8368 in the US, or 1-888-
SEL-KIRK or 1-888-735-5475 in Canada), Protech
System, Inc. (800-766-3473), Z-Flex (800-654-5600)
or American Metal Products (800-423-4270). Pipe
joints must be positively sealed. Follow the vent man-
ufacturer’s installation instructions carefully.
Outdoor Installation
The stackless top provided with the heater is the stan-
dard venting method for outdoor installations. The
stackless top may be used in its standard top-mount-
ed configuration or moved to the rear of the heater for
a rear-exhaust configuration. See the diagram below.
A few reasons why the rear stackless top may be con-
** Subtract 10 ft per elbow. Max. 4 elbows.
Category III Horizontal Vent & Horizontal Direct Vent
Model
No.
Certified
Vent
Material
Vent
Size
(in.)
Maximum
HorizontalVent
Length (ft)**
Combustion Air
Intake Pipe
Material
Air Intake
Max. Length** (ft)
4” Ø
409
Category III
6 80
Galvanized Steel,
PVC,
ABS,
CPVC
80
259
409
5
40
259 80
259 4 40
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