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13
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES LENGTH x USED = LENGTH
Rect angul ar-t o-Round 5 Ft . (1.5 m) x ( ) = Ft . or m
Transi ti on Adaptor*
Wall Cap 40 Ft . (12.2 m) x ( ) = Ft . or m
90° Elbow 10 Ft . (3 m) x ( ) = Ft . o r m
45° Elbow 5 Ft . (1.5 m) x ( ) = Ft . or m
90° Elbow 25 Ft . (7.6 m) x ( ) = Ft . or m
45° Elbow 5 Ft . (1.5 m) x ( ) = Ft . or m
Roof Cap 24 Ft . (7.3 m) x ( ) = Ft . or m
St raight Duct 6“ (15.2 cm) 1 Ft . (0.3 m) x ( ) = Ft . or m
Round or 3
1
⁄4“ x 10“
(8.2 x 25.4 cm Rect angul ar)
Tot al Duct w ork = Ft . o r m
Equi valen t l en gt h s of duct pi eces are based on act ual tests
and r ef l ect r equi r em ent s for good venting per for man ce wit h
any vent hood.
* I M PO RTANT : 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 al l ow fr ee movemen t of the damper
.
NO T E: If you need to install ducts, note that the total
duct length of 3
1
⁄4” x 10” ( 8.2 x 25.4 cm) r ectangul ar or
” (15.2 cm) diameter round duct
Outside ventilation requires an EXTERNAL EXHAUST
NO T E: It is important that venting be installed using
t h e m o st d i r ec t r o u t e an d wi t h as f ew el b o ws as p o ssi b l e.
Thi s en sur es cl ear venti n g of exhaust and hel ps pr event
blockages. Al so, make sure damper s swi ng f reely and
nothing is blocking the ducts.
Exhaust connection:
The exhaust adaptor has been desi gned to mate wit h
a st and ar d 3
1
⁄4” x 10” ( 8.2 x 25.4 cm) r ectangul ar duct.
If a round duct is required, a rectangular-to-round
Maximum duct length:
For satisfactory air movement, the total duct length of
3
1
⁄4” x 10” ( 8.2 x 25.4 cm) r ectangul ar or
6 ” ( 15.2 cm)
diameter round duct should not
ex ceed 120 equi valent
f eet (36.5 m).
Elbow s, t ransitions, w all and roof caps,
etc.,
pr esen t ad d i t i on al r esi st an ce t o ai r fl ow and ar e
equivalent to a section of straight duct which is longer
than their actual physical size. When calculating the total
duct length, add the equivalent lengths of all transitions
and adaptors plus the length of all straight duct sections.
The chart below shows you how to calculate total
equivalent ductwor k l ength usin g the appr oxi mate feet
of equivalent length of some typical ducts.
Inst allat ion Instructions
INSTALLATION INSTRUCTIONS FOR EXTERNAL EXHAUST DUCTING
DUCT.Read the following carefully.
( 12.5”
should not exceed 120 equivalent f eet (36.5 m).
di ameter / 6
( 12.5”
di ameter /
7 cm)
7 cm)
transition adaptor must be used.
diameter duct is acceptable to use.
"
A 5"""''''' " (12.7cm)/ 6" (15.2cm)
"
EN-10
INSTALLATION
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