21
W415-0777 / 03.02.09
3.3 USING RIGID VENT COMPONENTS
The vent system must be supported approximately every 3 feet for both vertical and horizontal runs. Use Wolf
Steel vent spacers W615-0033 every 3 feet and on either side of each elbow to maintain the minimum 1 1/4”
clearance between the outer rigid vent pipes and inner rigid vent pipes. Use Wolf Steel Ltd. support ring
assembly or equivalent noncombustible strapping to maintain the minimum clearance to combustibles for both
vertical and horizontal runs.
All inner exhaust and outer intake vent pipe joints may be sealed using either red high temperature silicone
sealant W573-0002 (not supplied) or black high temperature sealant W573-0007 Mill Pac (not supplied) with
the exception of the appliance exhaust flue collar which must be sealed using Mill Pac.
25.1
3.3.1 HORIZONTAL AIR TERMINAL INSTALLATION
A.
Move the appliance into position. Measure the
vent length required between terminal and
appliance taking into account the additional
length needed for the finished wall surface and
any 1¼" overlaps between venting components.
B.
Apply high temperature sealant W573-0007 (not
supplied) to the outer edge of the inner collar of the
appliance. Attach the first inner rigid pipe component
and secure using 3 self tapping screws. Repeat using
the outer rigid pipe.
C.
Insert the vent pipes through the firestop maintaining the required clearance to
combustibles. Holding the air terminal (lettering in an upright, readable position),
secure to the exterior wall and make weather tight by sealing with caulking (not supplied).
The air terminal mounting plate may be recessed into the exterior wall or siding no greater than the depth of the
return flange.
26.3
SCREWS
#10x2"
OUTER
RIGID
PIPE
CAULKING
INNER
RIGID
PIPE
2” OVERLAP
HI-TEMP
SEALANT
3.3.2 EXTENDED HORIZONTAL AIR TERMINAL INSTALLATION
A.
Follow the instructions for "HORIZONTAL AIR TERMINAL
INSTALLATION", items 1 to 3.
B.
Continue adding components alternating flexible and rigid vent
pipes. Ensure that all 4" flexible vent pipes and elbows have
sufficient vent spacers attached and each component is securely
fastened to the one prior. Attach the 7" telescopic sleeve to the vent run.
Secure and seal. To facilitate completion, attach 4" and 7" couplers to the
air terminal.
C.
Install the air terminal. See item 3 of the Horizontal Air Terminal Installation.
Extend the 7" telescopic sleeve; connect to the air terminal assembly. Fasten with
self tapping screws and seal.
TELESCOPIC SLEEVE
VENTING
AIR TERMINAL
20"
COUPLER
48.3
!
WARNING
Risk of fire, do not allow loose materials of insulation to touch the vent pipe. Remove insulation to
allow for the installation of the attic shield and to maintain clearances to combustibles.
FIGURE 3.3.1
FIGURE 3.3.2
