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NOTE:
duct length of 3
1 4
duct should not exceed 140 equivalent feet.
NOTE: It is important that venting be installed using
the most direct route and with as few elbows as possible.
blockages. Also, make sure dampers swing freely and
nothing is blocking the ducts.
Exhaust connection:
a standard 3
1 4
If a round duct is required, a rectangular-to-round
transition adaptor must be used. Do not use less than
a 6 diameter duct.
DUCT PIECES
Straight Duct 6
3
x 10
1 4
IMPORTANT: If a rectangular-to-round transition
adaptor is used, the bottom corners of the
damper will have to be cut to fit, using the tin
snips, in order to allow free movement of the
damper.
Installation Instructions
EQUIVALENT
LENGTH
Maximum duct length:
3
x 10 rectangular or 6 diameter round duct should
1 4
not exceed 140 equivalent feet.
Elbows, transitions, wall and roof caps,
etc.,
present additional resistance to airflow and are
equivalent to a section of straight duct which is longer
duct length, add the equivalent lengths of all transitions
and adaptors plus the length of all straight duct sections.
equivalent ductwork length using the approximate feet of
NUMBER
USED
x
Total Ductwork
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
LENGTH
=
=
Ft.
5
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