Vermont Castings DVRT41 Homeowner's Installation And Operating Manual page 18

DVRT41 Direct Vent Gas Fireplace
Sealing vent pipe and firestop gaps with high
temperature sealant will restrict cold air being
drawn in around fireplace.
Fig. 34 Horizontal length requirement.
Step 7
Apply high temperature sealant to 4" (102mm) and 7"
(178mm) collars or the termination one inch away from
crimped end. Guide the vent terminations 4" and 7"
collard into their respective vent pipes. Double check
that the vent pipes overlap the collars by 2" (51mm).
Secure the termination to the wall with screws provided
and caulk around the wall plate to weatherproof. As an
alternative to screwing the termination directly to the
wall, you may also use expanding plugs or an ap-
proved exterior construction adhesive. You may also
attach the termination with screws through the inner
body into the 4" vent pipe, however for this method,
you must extend the 4" pipe approximately 6" (152mm)
beyond the outer face of the wall.
Support horizontal pipes every 36"
(914mm) with metal pipe straps.
Vertical Sidewall Installation
Flex Vent Pipe
NOTE: The 40" (1016mm) flex vent is used for 90° off
the top of the unit then out the back wall.
Follow Step 1 and 2 on Page 17.
Step 3
Install the four (4) spacer springs on the 4" flex vent
pipe. When installing the spacer springs around the 4"
pipe, stretch the spring to approximately 15" (381mm),
wrap the spring around the pipe and interlock the ends
of the spacer spring approximately 2" (51mm). Meas-
ure 6 " (172mm) from the end of the pipe. Place the
18
X
X
FP1182
next spring 5" (127mm) from the previously installed
spring. Place the next spring 6" (152mm) from the last
spring. Finally place the last spring 12" (305mm) from
the last spring installed. (Fig. 35)
4" Flex
Vent Pipe
Spacer
Spring
Fig. 35 Install spacer springs.
Step 4
Install the 4" (102mm) flex vent pipe to the appliance
collar as described on Page 12. Secure the end with
the first spring 6 " (172mm) from the flex pipe end to
the unit.
Step 5
Slide the 7" (178mm) flex vent pipe over the 4" flex
vent pipe and secure the 7" collar as described on
Page 12.
Step 6
Bend the flex pipe horizontal so the bottom of the
horizontal pipe measure 6 " (165mm) from the top of
the unit immediately after the 90° formation. (Fig. 36)
Be sure to follow the 1/2" (13mm) rise in a 12"
(305mm) horizontal run rule.
Step 7
Install the 4" flex then 7" flex to the termination.
Fig. 36 Bend flex vent at 90° so horizontal portion is 6 "
(165mm) off top of unit.
12"
(305mm)
6"
(152mm)
5"
(127mm)
6 "
(172mm)
FP1474
6 " (165mm)
FP1475
10006740