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Multiple Heater Horizontal venting arrangement.
PTS/U 40/25
PTS/U 50/30
PTS/U 75/50
PTS/U 100/65
PTS/U 125/80
PTS/U 150/100
PTS/U 175/110
PTS/U 200/125
INDIRECT VENTING
B.
products of combustion and provide fresh air for efficient combustion. Where unvented heaters are used, gravity
or mechanical means shall be provided to supply and exhaust at least 4 CFM per 1,000 Btu/hr input of installed
heaters. Exhaust vents must be located at the highest point above and in the vicinity of the heaters, and the inlet
vents must be located below the level of the heaters. An exhaust hood (Part #42924000) must be placed on the
flue adapter collar located on the end of the last body section when used unvented and must be mounted only in
an downward position as shown.
Form #43343530
July 08
COMMON VENTING OF MULTIPLE HEATERS IN CONFINED SPACES IS
PROHIBITED. If any heater connected to a common vent system for
multiple heaters is found inoperative, the heater should be
disconnected from the vent system and its entrance into the vent
system capped.
VENT SIZING TABLE — Multiple Heater Venting
Horizontal and vertical
1
4"
4"
4"
4"
4"
4"
4"
4"
(If a size is not available use the next larger size.)
(UNVENTED HEATERS) — This heater requires ventilation in the building to dilute the
Number of Heaters
2
3
4"
4"
4"
4"
4"
5"
5"
6"
5"
6"
6"
7"
6"
7"
6"
7"
COMMON VENT DIAMETER
–37–
Vertical Only
4
4"
5"
6"
6"
7"
7"
8"
8"
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