Lennox MERIT Series Installation Instructions Manual page 47

FOR THE PROVINCE OF ONTARIO, HORIZONTAL SIDE-
WALL VENT APPLICATIONS ONLY
For exterior horizontal venting applications, the 2" X 1.5"
reducer for 2" venting at the point where the exhaust pipe
exits the structure is not required in direct or non-direct
vent applications in the Province of Ontario. In these appli-
cations, the vent should be oriented such that the exhaust
plume is unobjectionable. If the installation requires more
separation between the flue gases and the building struc-
ture, a reducer may be installed on the exhaust pipe to
increase the flue gas velocity.
A − Clearance above grade or
average snow accumulation
B − Horizontal separation between
intake and exhaust
C − Exhaust pipe length
D − Wall support distance from top
of each pipe (intake/exhaust)
NOTE − Flue gas may be acidic and may adversely affect some building materials. If flue gases impinge
on the building materials, a corrosion−resistant shield should be used to protect the wall surface. The
shield should be constructed using wood, sheet metal or other suitable material. All seams, joints, cracks,
etc. in affected area, should be sealed using an appropriate sealant.
ADDENDUM FOR ALL PROVINCES OF CANADA
See below for venting in all provinces of Canada. Lennox
approves the following termination for use in all provinces
of Canada.
C
D
B
12"
A
2" (51MM) 3" (76MM)
Vent Pipe Vent Pipe
12" (305 mm) Min. 12" (305 mm) Min.
6" (152 mm) Min.
6" (152 mm) Min.
24" (610 mm) Max.
24" (610 mm) Max.
Per: Saskatchewan Code of Practice
6" (152 mm) Max. 6" (152 mm) Max.
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