UDAP/APD/UDBP Venting Requirements

Form I-UD&APD Series-V-PV (5-17), P/N 195675R20, Page 13
FIGURE 7 -
Attaching Double-
Wall (Type-B) Vent
Pipe to the Heater
Figure 7 - STEP 1
Place a continual 1/4” bead
of silicone sealant around the
circumference of the venter
outlet collar.
Do STEP 2 immediately after
STEP 1.
Figure 7 - STEP 2
Slide the double-wall pipe over the collar so that
the collar is inside the inner pipe. Push the double-
wall pipe tight to the heater cabinet. To secure the
connection, spaced equal distance around the pipe,
drill and insert three 3/4” long sheetmetal screws
through the pipe and into the collar. Do not over
tighten the screws.
SUPPLIER NOTE: The adapters for Flex-L vent pipe illustrated in FIGURE 8 is
not available from the heater manufacturer; the adapters are available from a
Flex-L brand vent pipe distributor. These instructions are designed to assist the
contractor who has selected to use Flex-L brand Category III vent pipe to install
a power vented heater with a 4” (102mm) venter outlet.
1. Attach the Adapter Pipe or Reducer to the Venter Collar
a) On the end of the adapter or reducer that attaches to the venter collar (the
end of the adapter with the double emboss without the locking ring hole), run
a continuous bead of high temperature silicone around the inside of the pipe.
See FIGURE 9.
FIGURE 8 - Flex-L
brand Vent Pipe
Adapters
4” (102mm) diameter, 12” long Adapter Pipe,
Flex-L
®
#SRARZA4, specially designed for
attaching Flex-L brand Category III vent pipe to
a Std Power Vent fan or blower type unit heater,
sizes 30, 45, 60, 75, 100, and 125 for 4” (102mm)
diameter vent pipe.
4” to 3” (102 to 76mm) diameter, 6-3/4” long
Adapter Reducer, Flex-L #SRARZA43, specially
designed for attaching Flex-L brand Category III
vent pipe to a Std Power Vent fan or blower type
unit heater, sizes 30, 45, and 60 for 3” (76mm)
diameter vent pipe.
ADDENDUM
Section B
-
Instructions for
Installing Flex-L
brand Category III
Vent Pipe on a Std
Power Vent fan or
blower type unit
heater
Vent ow
Vent ow
Slide the adapter pipe or reducer over the venter
outlet. Secure with a sheetmetal screw.
Run a continuous bead
of high temperature
silicone around the
inside of the pipe.
Sheetmetal Screw
FIGURE 9 - Attach to
Venter Outlet