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Form #43343330
May 08 –37–
Multiple Heater Vertical venting arrangement.
Total
Vent
Height
Vent Cap (Leslie
VersaCap Type B)
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
Wall 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
Flue Collar
adaptor
Plan View
Vent Cap
(Breidert or
equivalent Type L)
2 (5cm)
Clearance
Thimble
1/2 (12mm) fall per 20 ft
(6m) toward vent terminal
6 (15cm)
minimum
Swept Tee
4 Diameter
single wall Vent
Flue Collar
adaptor
2 (5cm)
Clearance
Thimble
1/2 (12mm) fall per 20 ft
(6m) toward vent terminal
6 (15cm)
minimum
Swept Y
See multiple
vent size table
for diameter
See multiple
vent size table
for diameter
VENT SIZING TABLE — Multiple Heater Venting
Number of Heaters
Horizontal and vertical Vertical Only
1 2 3 4
PTS/PTU 40 4” 4” 4” 4”
PTS/PTU 50 4” 4” 4” 5”
PTS/PTU 75 4” 4” 5” 6”
PTS/PTU 100 4” 5” 6” 6”
PTS/PTU 125 4” 5” 6” 7”
PTS/PTU 150 4” 6” 7” 7”
PTS/PTU 175 4” 6” 7” 8”
PTS/PTU 200 4” 6” 7” 8”
COMMON VENT DIAMETER
(If a size is not available use the next larger size.)