
Installation Instructions
NOTE: If you need to install ducts, note that the total
duct lengti_ of 3¼" x ]O" rectangular or 6" (liameter
round duct should not exceed 140 equivalent feet.
Outside ventilation requires a HOOD EXHAUST DUCT.
Read the following careflfllv.
NOTE: It is important that venting be installed using
the most direct route and with as few elbows as possible.
This ensm'es clear venting of exhaust and helps prevent
blockages. Also, make sure dampers swing freely and
nothing is blocking the ducts.
Exhaust connection:
The hood exhaust has been designed to mate with
a standard 3Vt" x 10" rectangular duct.
If a round duct is required, a rectangula>to-rotmd
transition adaptor must be used. Do not use less than
a 6" diameter duct.
Maximum duct length:
For satisfiwtorv air movement, the total duct length of
3¼" x ]0" 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 hinter than their
actual physical size. When calculating the total duct
length, add the equiwdent lengths of all transitions and
adaptors plus the length of all straight duct sections.
The chart below shows w)u how to calculate total
equivalent ductwork length using the approximate teet
of equiwdent length of some typical ducts.
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES LENGTH x USED = LENGTH
Rectangular-to-Round 5Ft. x ( ) =Ft.
Transition Adaptor
Wall Cap 40 Ft. x ( ) = Ft.
C)_ go° Elbow 10 Ft. x ( ) =Ft.
{_ 45° Elbow 5Ft. x ( ) = Ft.
90° Elbow 25 Ft. x ( ) =Ft.
J 45° Elbow 5Ft. x ( ) =Ft.
Roof Cap 24 Ft. x ( ) = Ft.
Straight Duct 6" Roundor 1Ft. x ( ) = Ft.
3W' x 10" Rectangular
Total Ductwork = Ft.
* IMPORTANT: If' a re( tangulal_to-round transilion E(ltfival( nl 1_ ngths of" du(t pieces are bas(d on aclual tests and
adaplor is use(l, the boltonl colners of lhe (]0Jllp( i l-(:_]ect reqtfir( m( nls lk)r good v( nling performan(e with any
_dll have I0 b( {:tit I1) fit, llSillg the till snips, ill V(llt hood.
(}lXiel I(} allo_ flee lllOV(>l)lelll Of' the ([HlllpeF.
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