Lennox DT3025 Installation Instructions Manual page 19

Horizontal Vent Terminations
In the United States, refer to local codes, ANSI Z223.1, and
the vent clearances chart indicated in figure 31 for horizontal
vent termination requirements. In Canada, refer to local
codes, CAN / CGA B149.1 or .2, and the vent clearances
chart indicated in figure 31.
Both round (figure 29) and rectangular (figure 30)
vent terminations are available for use in horizontal
applications. However, the rectangular termination
detailed in figure 30 is the only one approved for use
in applications without elbows as detailed in figure 26
or in corner installations as shown in figure 4.
ROUND HORIZONTAL VENT TERMINATION
3 in. (76mm) SPACER INTEGRAL
TO VENT TERMINATION AT TOP
OUTSIDE
WALL SURFACE
FACEPLATE INTEGRAL
TO VENT TERMINATION
VENT TERMINATION
1 in. (25mm) SPACER INTEGRAL TO VENT
TERMINATION AT BOTTOM AND SIDES
Note -
The termination faceplate shall not be recessed into a
wall or siding.
FIGURE 29
FIRESTOP / SPACER
AT INSIDE WALL SURFACE
3 in. (76mm)
1 in.
(25mm)
P a g e 1 9
The rectangular vent termination may be installed directly
on the fireplace vent collar. The termination can be ad-
justed to accommodate wall thicknesses from 5 in.
(127mm) to 9 in. (229mm). In applications with wall thick-
nesses ranging from 9 in. (229mm) to 13 in. (330mm), use
extension JVEXT4 (Catalog Number 12L01) between
fireplace vent collar and termination.
RECTANGULAR VENT TERMINATION
(Shown with rigid vent pipe)
FIRESTOP / SPACER
(See Note 1)
FRAMING
10-1/2
(267)
CENTER OF VENT
HORIZONTAL VENT
Notes -
1 - The firestop/spacer may be installed on either side
of the vent framing (interior or exterior side).
2 - The termination base shall not be recessed into a
wall or siding.
FIGURE 30
INCHES (mm)
HEAT DEFLECTOR
7
TERMINATION
(178)
(See Note 2)
5-1/8
12-1/8
(130)
(308)
BASE