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USE DURAFLEX AL
CAP ASSEMBLY
FOR VENTING GAS
APPLIANCES
TYPE B GAS VENT OR TYPE L VENT TERMINATION
This installation procedure is for use with Type B gas vent or Type L (oil/pellet) vent
near the top of the masonry chimney, or for extending the height of the venting system
above the masonry chimney.
Step 1. In addition to the Flex you will need a Pellet Vent Cap (for oil or pellet vents)
or a Gas Vent Termination Cap (Standard or High Wind), Storm Collar, Top Plate,
Flex Connector, and rigid pipe to extend the cap as needed. (Figures 17, 18)
Step 2. Attach the Flex Connector to the Flex Liner and secure the fast connect
band, then insert Pipe Section into the large end of the Flex Connector. Be sure inner
liners are properly aligned , then push the two together until the outer diameter of rigid
pipe is firmly against large end of Flex Connector, then secure upper fast connect
band, as shown in Figure 17.
Step 3. After attaching a suitable double-wall Type
B or L Vent Pipe Section to the Flex Liner with the
Flex Connector, seal the Top Plate to the masonry
chimney using non-hardening sealant. Slide the
appropriate Storm Collar over the Pipe Section, until
the proper length of pipe extends above the chimney.
Always have a minimum of 12 inches of rigid pipe
below the Top Plate for stability. Attach the Storm
Collar to the rigid Pipe Section with (4) 1/4-inch long
NorthlineExpress.com
USE DURAFLEX
SS CAP
ASSEMBLY FOR
OIL, PELLET OR
WOOD
APPLIANCES
FLEX LINER
TOP
PLATE
Fig 16
9.
http://www.northlineexpress.com
chimney using a bead of non-hardening
sealant around the top of the chimney
and underside of Top Plate (Figure
15).
Step 3. After sealing the Top Plate to
the masonry chimney, attach the
DuraFlex SS Cap Assembly (or
DuraFlex AL Cap Assembly if used
on a gas appliance) to the Flex Liner
and tighten the fast connect band, as
shown in Figure 16. Push the Liner
Cap down until it rests upon the Top
Plate.
Toll-Free 1-866-667-8454
FLEX
LINER
FLEX
COUPLER
Fig 17
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