Venting - Lennox DT3025 Installation Instructions Manual

Venting

General Requirements
These instructions should be used as a guideline and do
not supersede local codes in any way. Install vent accord-
ing to local codes, these instructions, the current National
Fuel Gas Code (ANSI-Z223.1) in the USA or the current
standards of CAN/CGA-B149.1 and -B149.2 in Canada.
This gas fireplace is equipped with a concentric vent col-
lar for ease of installation. The concentric vent pipe will
bring in outdoor air for combustion and will remove ex-
haust gases. Vent terminations are ordered separately.
This Lennox gas fireplace is for use only with Lennox
approved concentric vent pipe: rigid vent pipe in vertical
venting applications, and rigid or flexible vent pipe in
horizontal applications. Each vent must be terminated
using a Lennox vent termination. Approved venting kits
and components are listed on page 26 of this manual.
NOTE - The vent terminations are certified for use
with this unit and must be installed without modifica-
tion.
WARNING
All vent system connections/joints must be properly
sealed using only Lennox MILL-PAC BLACK HIGH
TEMPERATURE SEALANT, Catalog Number 10K81.
Failure to properly seal the vent system could allow
carbon monoxide leakage resulting in injury or death.
Sealing and Joining Rigid Vent Pipe
Apply only Lennox MILL-PAC BLACK HIGH TEM-
PERATURE SEALANT (Catalog number 10K81)
around outside of inner and outer vent collars before
assembling vent to collar. Outer pipe must also be se-
cured to outer collar using three sheet metal screws.
See figure 11. Sealant must be applied to all rigid pipe
joints and the outer pipe must be secured with three
sheet metal screws.
SECURING RIGID VENT PIPE TO COLLAR
APPLY ONLY LENNOX MILL-PAC BLACK HIGH
TEMPERATURE SEALANT (Catalog No. 10K81)
AND SLIDE RIGID PIPE OVER INNER AND
OUTER COLLARS.
NOTE - The bottom part of
the outer pipe is omitted in
order to show the detail of
the inner pipe.
Sealing and Connecting Flexible Vent Pipe
Flexible vent pipe is packaged and shipped in its con-
tracted state. When installing flexible vent pipe, its length
may be expanded to twice its contracted size. You should
expect to extend a 3 ft. section of flexible pipe up to 6 ft.
Under no circumstances, may separate sections of
concentric flexible vent pipe be joined together.
When flexible vent pipe is used, both inner and outer
pipes should be secured to the fireplace concentric
collar and to the vent termination using only Lennox
MILL-PAC BLACK HIGH TEMPERATURE SEALANT
(Catalog number 10K81) and metal gear clamps as
shown in figure 12.
SECURING VENT PIPE TO COLLAR
NOTE - Part of the outer
pipe is pulled away to show
the detail of the inner pipe.
APPLY ONLY LENNOX MILL-PAC
BLACK HIGH TEMPERATURE
SEALANT (Catalog No. 10K81)
AND SLIDE FLEXIBLE PIPE OVER
INNER AND OUTER COLLARS.
HOLES PROVIDE
SCREWDRIVER ACCESS
FOR TIGHTENING INNER
GEAR CLAMP.
P a g e 1 2
USE THREE SCREWS TO
SECURE OUTER VENT
PIPE TO OUTER COLLAR
FIGURE 11
IMPORTANT
FIGURE 12
RIGID VENT
PIPE
FLEXVENT
GEAR
CLAMPS
OUTER
COLLAR