Page 13
Vertical Venting Through the Roof
This Lennox gas fireplace is for use only with Lennox
approved concentric vent pipe; only rigid vent pipe may
be used when vertically venting the fireplace through
the roof.
DT/DTH Applications - See figures 16, 17, or 18 for vent
length requirements using concentric vent pipe.
DR/DRH Applications - See figures 19, 20, or21 for vent
length requirements using concentric vent pipe.
DT/DTH and DR/DRH Applications -
Figure 15provides a detail of thevertical venttermination.
Figure 22 shows the minimum vent termination height re-
quirements above a flat or sloped roof.
General guidelines for vertical vent installations:
1- DT/DTH Models -
Install a vent restrictor (provided) in the flue outlet as
shown in figure 13.
VENT RESTRICTOR INSTALLATION
WHEN USING THE TOP FLUE OUTLET IN VERTICAL VENTING
APPLICATIONS, INSTALL RESTRICTOR FLUSH WITH FLUE
COLLAR OUTLET.
SIDE VIEW
FLUSH
RESTRICTOR
INNER
COLLAR
CABINET TOP
(DT/DTH UNITS ONLY)
COLLAR
OUTER
RESTRICTOR
TOPFLUEOUTLET
FIGURE 13
1 - Provide a firestop / spacer any time vent pipe must
pass through a combustible floor, ceiling or wall. See
figure 14. Refer to listing on page26 for catalog num-
bers of Lennox firestop spacers.
2- Horizontal sections of the vent pipe run should
be sloped upward aminimum of 1/4in. per foot of
horizontal vent in the direction away from the
fireplace. In addition, horizontal sections of pipe
must be supported using metal straps spaced
every 2 ft.
3 - Maintain proper clearances any time vent pipe must
pass through insulated spaces. Use insulation shield
when vent pipe passes through any insulation.
4- Two45
_
elbows may be used in place of one 90
_
el-
bow. This can only occur once in the entire venting
system.
One 45
_
elbow may be substituted for one 90
_
elbow
at any point in the venting system.
The same rise to run ratios as shown in the venting
figures must be followed if 45
_
elbows are used.
FIRESTOP / SPACER
(Vertical Applications Shown)
NOTE - Horizontal ap-
plications require 3 inch
(76mm) clearance above
top of vent.
FIGURE 14
VERTICAL TERMINATION DETAIL
LENNOX MILL-PAC
BLACK HIGH
TEMPERATURE
SEALANT
(Catalog Number 10K81)
RIGID VENT
FIGURE 15
To Next Page
Loading...
Need help?
General
