Form #42710000
May 2013
-21-
MULTIPLE HEATE
MULTIPLE HEATE
MULTIPLE HEATE
MULTIPLE HEATER VENTING (CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
R VENTING (CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
R VENTING (CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
R VENTING (CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
Requirements for venting of multiple heaters are the same as described for SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING except as
follows:
1.
The common vent size and total vent height is normally determined by the number of heaters per common
vent, length of horizontal connector runs, and connector rise. Connector lengths should be as short as
possible and have a minimum 1/4 inch per foot rise. Without regard to connector rise and total vent height
due to many possible venting configurations, the following should be observed:
•
Common vent pipe & vent connector diameter should be no less than that shown in the following Vent
Sizing Table.
•
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
