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Vent
Connectors: From Heating Appliance to Chimney
Definition
Vent connectors are metal pipes
that carry exhaust gases from an appliance to a chimney flue. They should
be made of non-combustible, non-corrosive material that can withstand flue
gas condensate and temperatures.
Installation
Vent connectors should rise at least
1/4 inch per foot. They should be supported with wire or strapping every
4 feet and the joints must be screwed together with sheet metal screws.
The joints should be aligned so that
they will be liquid-tight or of a design that liquid will drain to the
interior of the connector.
The horizontal run of the vent
connector should be as short as possible and never more than 75% of the
height. Longer vent connectors allow heat to dissipate,
condensation to form and corrosion to accelerate.
Types
of Vent Connectors
There are generally 3 types of
vent connectors used in residential systems, but the overwhelming majority
of them are single wall metal connectors.
.
Depending on the appliance and installation, clearance to combustibles
should be 9 to 18 inches. If the listing of an appliance specifies a
different clearance, the listed clearance applies.
Double wall, uninsulated, or “B”
vent . Clearance to combustibles is
typically 6 inches. “B” and “L” vents may be in
accordance with the appliance and vent listing.
.
Clearance to combustibles should be 1 or 2 inches, or as the
appliance or vent listing allows.
(Type “C” vents will also
have appliance and vent listings that will indicate the allowable
clearances.)
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