R
DV400S DIRECT VENT ROOM HEATER
LISTED
HORIZONTAL OVERHANG
VERTICAL WALL
2 Ft. Min.
EXHAUST
INTAKE AIR 
2Ft.
Min.
CAP
LOWEST
DISCHARGE
OPENING
X
12
ROOF PITCH IS X/12
H
WALL THIMBLE/
TRIM COLLAR
SEAL WITH SILICONE
SEAL WITH SILICONE
24" MINIMUM VERTICAL HEIGHT 
VENTING
6"
4'' UL 1777 LISTED GAS VENT INNER FLEX LINER
INSIDE CHIMNEY DIAMETER
6" MINIMUM
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 |
|
|
Figure 10 -Vent (Chimney) Height
WARNING
WHEN VENT SECTIONS EXCEEDING 3 FEET IN LENGTH ARE INSTALLED BETWEEN AN OFFSET/RETURN, STRUCTURAL SUPPORT MUST BE PROVIDEDTO REDUCE
Figure 11
Adaptation to Masonry Chimney
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.
March 4, 2002 | Page 16 | 30211C |
