Empire Comfort Systems DVL36BP30 Series Installation Instructions Manual page 44

DVVK-4FV DIRECT VENT TERMINATION KIT (CONT'D)
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-installed connector), then slide the flex flue over the 4 inch
diameter hard pipe flue. Be sure to overlap at least 1-1/4 inch.
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 inch, 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 59 and pre-install the roof
jack assembly to the hard pipe approximately 18 inches from
the top end of the hard pipe.
Page 44
Figure 59
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 four nails/screws through each support bracket. Check
that the combustible clearances through the roof framing will
maintain at least a 1" 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 60. 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.
ROOF PITCH
Flat to 6/12
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 16/12
Over 16/12 to 21/12
H (Min.)
12" (305 mm)
15" (381 mm)
18" (457 mm)
24" (610 mm)
36" (914 mm)
Figure 60
41978-1-1220