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F-Horizontal Venting-Residential Two Pipes
1-For horizontal residential installations these units are
certified as Category I appliances. The vent may be
single wall material minimum 25 GSG (0.46mm)
galvanized steel or equivalent grade stainless steel or
a single section of type B-1 vent installed according to
the sections Venting A-General Recommendations
and Requirements and C-Horizontal Venting
General and F-Horizontal Venting–Residential Two
Pipes. Refer to figure 6.
2-The vent pipe diameter for horizontal residential
installations shall be 4” (100mm) on 45 units and 5”
(127mm) on 60/75/100/125 units. Refer to table 4 for
vent diameter and termination requirements.
3-The maximum vent length is 5’ (1.5m) plus one 90-
degree elbow.
4-The vent must maintain a ¼” rise per foot of slope
upwards toward the termination
TABLE 4
HORIZONTAL VENT REQUIREMENTS
FLUE TYPE FLUE DIA. VENT CAP MODEL INSTALLATION
AIR INLET TYPE INLET AIR
DIA.
INLET AIR CAP
MAX. VENT
LENGTH (MIN.
VENT LENGTH 3’)
SINGLE WALL 4” TEE or
4” BELMONT
45 RESIDENTIAL
SINGLE WALL PIPE or
METAL FLEX VENT
3” TEE or
3” BELMONT
5’ MAY USE ONE
SECTION OF
B-VENT
CONCENTRIC 4” 45 RESIDENTIAL
SINGLE WALL PIPE or
METAL FLEX VENT
3”
4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
5’
SINGLE WALL 3” TEE or
3” BELMONT
45 COMMERCIAL
SINGLE WALL PIPE or
METAL FLEX VENT
3” TEE or
3” BELMONT
25’ MAY USE ONE
SECTION OF
B-VENT
CONCENTRIC 3” 45 COMMERCIAL
SINGLE WALL PIPE or
METAL FLEX VENT
3”
4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
25’
SINGLE WALL 5” TEE or
5” BELMONT
60, 75 RESIDENTIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4” TEE or
4” BELMONT
5’ MAY USE ONE
SECTION OF
B-VENT
CONCENTRIC 4” 60, 75 RESIDENTIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4”
4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
5’
SINGLE WALL 4” TEE or
4” BELMONT
60, 75 COMMERCIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4” TEE or
4” BELMONT
25’ MAY USE ONE
SECTION OF B-
VENT
CONCENTRIC 4” 60, 75 COMMERCIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4”
4” CONCENTRIC
VENT/ ADAPTER/CAP
KIT REQUIRED
25’
SINGLE WALL 5” TEE or
5” BELMONT
100, 125 RESIDENTIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4” TEE or
4” BELMONT
5’ MAY USE ONE
SECTION OF
B-VENT
SINGLE WALL 5” TEE or
5” BELMONT
100, 125 COMMERCIAL
SINGLE WALL PIPE or
METAL FLEX VENT
4” TEE or
4” BELMONT
5’ MAY USE ONE
SECTION OF
B-VENT