Installation guide

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Installation Instructions

INSTALLATION INSTRUCTIONS FOR EXTERNAL EXHAUST DUCTING

NOTE: If you need to install ducts, note that the total

duct length of 31/4" x 10" (8.2 x 25.4 cm) rectangular or

5" (10.5 cm) diameter/ 6" (15.2 cm) diameter round duct

should not exceed 120 equivalent feet (36.5 m).

Outside ventilation requires a EXTERNAL EXHAUST

DUCT.Read the following carefully.

NOTE: It is important that venting be installed using

the most direct route and with as few elbows as possible.

This ensures clear venting of exhaust and helps prevent

blockages. Also, make sure dampers swing freely and

nothing is blocking the ducts.

Exhaust connection:

The exhaust adaptor has been designed to mate with

a standard 31/4'' x 10" (8.2 x 25.4 cm) rectangular duct.

If a round duct is required, a rectangular-to-round

transition adaptor must be used. Do not use less than

a 6" (15.2 cm) diameter duct.

Maximum duct length:

For satisfactory air movement, the total duct length of

31/4'' x 10" (8.2 x 25.4 cm) rectangular or 5" (10.5 cm)

diameter/6 "(15.2 cm) diameter round duct should not

exceedl20 equivalent feet (36.5 m).

Elbows, transitions, wall and roof caps,

etc., present additional resistance to airflow and are

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 phrs the length of all straight duct sections.

The chart below shows you how to calculate total

equivalent ductwork length using the approximate feet

of equivalent length of some typical ducts.

DUCT PIECES

Rectangular-to-Round

TransitionAdaptor*

Wall Cap

90° Elbow

45° Elbow

90° Elbow

45° Elbow

RoofCap

StraightDuct6" (15,2cm)

Roundor 31/4``x 10"

(8,2x 25,4cm)Rectangular

EQUIVALENT

LENGTH

5 Ft,(1,5m)

40Ft, (12,2m)

10Ft, (3m)

5 Ft,(1,5m)

25Ft, (7,6m)

5 Ft,(1,5m)

24Ft, (7,3m)

1 Ft,(0,3m)

NUMBER

x USED

x ()

Total Ductwork

EQUIVALENT

LENGTH

Ft,orm

Ft. or m

* 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.

Equivalent lengths of duct pieces are based on actual tests

and reflect requirements ti)r good venting pertbrmance with

any vent hood.