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5
EQUIVALENT NUMBER
DUCT PIECES LENGTH x USED = LENGTH
Rectangular-to-Round 5Ft. x () = Ft.
TransitionAdaptor*
WallCap 40Ft. x () = Ft.
90°Elbow 10Ft. x () = Ft.
45°Elbow 5Ft. x () = Ft.
90°Elbow 25Ft. x () = Ft.
45°Elbow 5Ft. x () = Ft.
RoofCap 24Ft. x () = Ft.
Straight Duct 6″Roundor 1Ft. x () = Ft.
3
1
⁄4″ x 10″Rectangular
Total Ductwork = Ft.
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
anyventhood.
* 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
NOTE: Ifyouneedtoinstallducts,notethatthetotal
duct length of 3
1
⁄4″x10″rectangularor6″diameterround
duct should not exceed 140 equivalent feet.
OutsideventilationrequiresaHOODEXHAUSTDUCT.
Readthefollowingcarefully.
NOTE: It is important that venting be installed using
the most direct route and with as few elbows as possible.
Thisensuresclearventingofexhaustandhelpsprevent
blockages. Also, make sure dampers swing freely and
nothing is blocking the ducts.
Exhaust connection:
Thehoodexhausthasbeendesignedtomatewith
a standard 3
1
⁄4″x10″rectangularduct.
If a round duct is required, a rectangular-to-round
transition adaptor must be used. Do not use less than
a 6″ diameter duct.
Maximum duct length:
Forsatisfactoryairmovement,thetotalductlengthof
3
1
⁄4″ x 10″ rectangular or 6″ diameter round duct should
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
thantheiractualphysicalsize.Whencalculatingthetotal
duct length, add the equivalent lengths of all transitions
and adaptors plus the length of all straight duct sections.
Thechartbelowshowsyouhowtocalculatetotal
equivalent ductwork length using the approximate feet of
equivalentlengthofsometypicalducts.
1” = 2.5 cm; 1’ = 0.3 m
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