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10. With the flex vent assembly and the 48 inch long hard pipe
components laid out on the floor, begin securing these parts
together. First, apply a generous bead of silicone sealant to
the inside of the 4-inch diameter flex flue (not the end with
the pre-installaed connector), then slide the flex flue over the
4-inch diameter hard pipe flue. Be sure to overlap at least
1-1/4 inches. Secure this connection with a 4-inch diameter
band clamp provided. Be careful not to damage or tear the
flex flue when tightening clamp.
11. Repeat the connection process for the outer 7-inch diameter
flex vent to hard pipe connection. Use silicone sealant at this
joint also, overlap at least 1-1/4 inches, then secure the joint
with the 7-inch diameter band clamp provided. Be careful
not to damage or tear the flex vent pipe when tightening the
clamp.
12. While the venting is still on the floor, assemble the roof jack
components as shown in
Figure 31
and pre-install the roof
jack assembly to the hard pipe approximately 18 inches from
the top end of the hard pipe.
13. Now the pre-assembled vent system may be carried to the
roof, then lowered through the roof cutout opening (see step
5). Feed the flex vent end down through the roof opening and
firestop/thimble assembly installed in steps 4 through 6.
14. Secure the roof support assembly to the roof sheathing with
at least (4) nails/screws through each support bracket. Check
that the combustible clearances through the roof framing will
maintain at least a 1 inch clearance from the vent pipe.
15. Determine how high the vent terminal should be located
above the roof line based on the roof pitch information shown
in
Figure 32.
Adjust the vent system height by loosening the
pre-installed roof support pipe clamp and sliding the vent pipe
up or down as pre-determined, then re-tighten the pipe clamp.
Install a couple of sheet metal screws through the pipe clamp
into the outer hard vent pipe to lock in place.
16. Check to make sure that the bottom end of the flex vent is
long enough to reach the fireplace adapter collars. If too long,
trim off the extra flex vent not needed.
WING NUT (2)
PIPE CLAMP
ROOF BRACKET (2)
NUT (2)
SCREW (2)
H
X
12
ROOF PITCH IS X/12
H (Min.) - Minimum height from
roof to lowest discharge opening
DISCHARGE
LOWEST
OPENING
VENT CAP
GAS VENT
Figure 31
Figure 32
ROOF PITCH
H (Min.)
Flat to 6/12
12” (305mm)
6/12 to 7/12
15” (381mm)
Over 7/12 to 8/12
18” (457mm)
Over 8/12 to 16/12
24” (610mm)
Over 16/12 to 21/12
36” (914mm)
DVVK-4FV DIRECT VENT TERMINATION KIT (CONT'D)
