Filter
Top Products
March 4, 2002 Page 16 30211C
DV400S DIRECT VENT ROOM HEATER
R
C. Existing Masonry Chimney Installation
This installation is subject to local jurisdic-
tion. Some codes may require the use of
another liner for intake air. If so, the 4”
aluminum liner should be inside a 6” UL 181
listed liner.
This Heater can be vented through an existing
Masonry Chimney but the chimney must be lined
with one UL 1777 listed 4” aluminum flexible gas
vent liner for exhaust. The existing Flue will be
used to supply the air intake to the galvanized
steel Flue system. See Figure 11.
Figure 11
Adaptation to Masonry Chimney
WALL THIMBLE/
TRIM COLLAR
INSIDE CHIMNEY
DIAMETER
6" MINIMUM
4'' UL 1777 LISTED
GAS VENT INNER
FLEX LINER
24" MINIMUM
VERTICAL HEIGHT
DURA-VENT GS
VENTING
6"
INTAKE AIR
EXHAUST
SEAL WITH SILICONE
SEAL WITH SILICONE
WARNING
WHEN VENT SECTIONS EXCEEDING 3 FEET
IN LENGTH ARE INSTALLED BETWEEN AN
OFFSET/RETURN, STRUCTURAL SUPPORT
MUST BE PROVIDED TO REDUCE OFF-CENTER
LOADING AND PREVENT VENT SECTIONS
FROM SEPARATING AT THE VENT JOINTS.
Figure 10 -Vent (Chimney) Height
H (MIN.)-MINIMUM HEIGHT
FROM ROOF TO LOWEST
DISCHARGE OPENING
ROOF PITCH IS X/12
LISTED
CAP
LOWEST
DISCHARGE
OPENING
12
X
2 Ft.
Min.
2 Ft. Min.
VERTICAL WALL
HORIZONTAL OVERHANG
Roof Pitch H (min.) ft.
flat to 6/12 1.0
6/12 to 7/12 1.25
over 7/12 to 8/12 1.5
over 8/12 to 9/12 2.0
over 9/12 to 10/12 2.5
over 10/12 to 11/12 3.25
over 11/12 to 12/12 4.0
over 12/12 to 14/12 5.0
over 14/12 to 16/12 6.0
over 16/12 to 18/12 7.0
over 18/12 to 20/12 7.5
over 20/12 to 21/12 8.0