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STEP 1: Place continual 1/4-
inch bead of silicone sealant
around circumference of
single-wall pipe.
STEP 2: Before sealant can dry,
insert single-wall pipe into inner
pipe of double-wall pipe until
bead of sealant contacts inner
pipe to create sealed joint.
STEP 3: Drill three small holes
spaced equally around double-
wall pipe below sealant ring.
Secure joint using 3/4-inch-
long sheet metal screws. Do
not overtighten screws.
Double-
Wall Pipe
STEP 4: Place continual 3/8-
inch bead of silicone sealant
around he circumference of
vent cap collar to prevent any
water inside vent cap from
running down double-wall pipe.
STEP 6: Drill small hole
through vent cap and double-
wall pipe. Secure joint using
3/4-inch-long sheet metal
screw. Do not overtighten
screw.
STEP 5: Before sealant can dry,
insert collar on vent cap as far
as possible inside inner wall of
double-wall pipe. Apply silicone
sealant to fully close any gaps
between vent cap and double-
wall pipe to prevent water from
entering double-wall pipe.
STEP 7: Place continual 1/4-
inch bead of silicone sealant
around circumference of
venter outlet collar.
STEP 8: Before sealant can dry, slide double-wall pipe over collar
so that collar is inside inner pipe. Push double-wall pipe tight to
heater cabinet. Drill three small holes through the pipe and into collar
spaced equally around pipe below sealant ring. Secure joint using
3/4-inch-long sheet metal screws. Do not overtighten screws.
Figure 8. Instructions for Connecting Double-Wall Type B Vent Pipe to Single-Wall Pipe
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