Form 43343350
-44-
Oct 2013
Total
Vent
Height
Vent Cap
Flashing
2 (5cm)
Clearance
Thimble
Seal Joint
and Annular
Space
10 ft (305cm)
or less
2 ft (77cm)
minimum
2 ft (77cm) minimum
(when no wall or
parapet exists)
4 Diameter
single wall Vent
W
all or
Parapet
See multiple
vent size table
for diameter
Flue Collar
adaptor
Connections to the common vent
must be arranged to avoid direct
opposition of exhaust products.
Plan View
Multiple Heater Horizontal Venting Arrangement
4 diameter
single wall vent
Plan View
Vent Cap
(Breidert or
equivalent)
2 (5cm)
Clearance
Thimble
6 (15cm)
minimum
Y Connector
4 diameter
single wall vent
2 (5cm)
Clearance
Thimble
1/2 (12mm) fall per 20 ft
(6m) toward vent terminal
6 (15cm)
minimum
Y Connector
See Vent
Sizing Table
for diameter
See Vent
Sizing Table
for diameter
1/2 (12mm) fall per 20 ft
(6m) toward vent terminal
Flue Collar
Adaptor
Flue Collar
Adaptor
VENT SIZING TABLE
VENT SIZING TABLE
VENT SIZING TABLE
VENT SIZING TABLE —
—
—
—
Multiple Heater Venting
Multiple Heater Venting
Multiple Heater Venting
Multiple Heater Venting
Number of Heaters
Number of Heaters
Number of Heaters
Number of Heaters
Horizontal and vertical
Horizontal and vertical
Horizontal and vertical
Horizontal and vertical
Vertical Only
Vertical Only
Vertical Only
Vertical Only
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
R(B,S,M) S/U 040
4”
4”
4”
4”
R(B,S,M) S/U 050
4”
4”
4”
5”
R(B,S,M) S/U 075
4”
4”
5”
6”
R(B,S,M) S/U 100
4”
5”
6”
6”
R(B,S,M) S/U 125
4”
5”
6”
7”
R(B,S,M) S/U 150
4”
6”
7”
7”
R(B,S,M) S/U 175
4”
6”
7”
8”
R(B,S,M) S/U 200
4”
6”
7”
8”
COMMON VENT DIAMETER
COMMON VENT DIAMETER
COMMON VENT DIAMETER
COMMON VENT DIAMETER
(If a size is not available use the next larger size.)
