Form 43471030
-22-
Sept 2011
•
The connector length should be no more than 75% of the vertical portion of vent above the connector.
•
Where possible, use a Y-connector to the common vent.
2.
Material for connectors should be constructed of galvanized sheet metal or other approved noncombustible
corrosion resistant material as allowed by state or local codes. All common vent pipe should be insulated
flue pipe or double-wall, Type B vent.
3.
Avoid unnecessary bends. Limit to two (2) 90º elbows.
4.
The entire length of vent connector shall be readily accessible for inspection, cleaning and replacement.
5.
Groups of heaters with a common vent must be controlled by a common thermostat.
If any heater connected to a common vent system for multiple
If any heater connected to a common vent system for multiple
If any heater connected to a common vent system for multiple
If any heater connected to a common vent system for multiple
heaters is found inoperative, the heater should be disconnected from
heaters is found inoperative, the heater should be disconnected from
heaters is found inoperative, the heater should be disconnected from
heaters is found inoperative, the heater should be disconnected from
the vent system and its entrance into the vent system capped.
the vent system and its entrance into the vent system capped.
the vent system and its entrance into the vent system capped.
the vent system and its entrance into the vent system capped.
Multiple Heater Vertical Venting Arrangement
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 Vent
Sizing Table for
diameter
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
2 (5cm)
Clearance
Thimble
6 (15cm)
minimum
Y Connector
4 diameter
single wall vent
2 (5cm)
Clearance
Thimble
no less than 1/4 (6mm)
rise per foot (0.3m)
toward vent terminal
6 (15cm)
minimum
Y Connector
See Vent
Sizing Table
for diameter
See Vent
Sizing Table
for diameter
no less than 1/4 (6mm)
rise per foot (0.3m)
toward vent terminal
