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Installation, Calculating duct length table – Electrolux EI30DD10KS User Manual

Page 14

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14

Installation

Calculating Duct Length Table

For maximum efficiency, use the shortest and straightest duct possible. The system will operate most

efficiently when the ductwork does not exceed 60 feet of equivalent duct. The downdraft will operate

properly with ductwork up to 100 equivalent feet of duct.
Calculations are approximate and based on HVAC industry standards.

TOTAL DUCTWORK

Ft. or m

EQUIVALENT

LENGTH X

NUMBER

USED =

EQUIVALENT

LENGTH

m

r

o

.

t

F

Straight

m

r

o

.

t

F

)

m

3

(

.t

F

0

1

90° Elbow

m

r

o

.

t

F

15 Ft. (4.6m)

90° Flat Elbow

m

r

o

.

t

F

)

m

9

(

.t

F

0

3

m

r

o

.

t

F

25 Ft. (7.6m)

Wall Cap with Damper

m

r

o

.

t

F

)

m

5

.

1

(

.t

F

5

m

r

o

.

t

F

)

m

5

.

1

(

.t

F

5

45° Elbow

8" or 10” (20.3cm or 25.4cm)

ROUND DUCT PIECES

3¼" x 14" (8.2cm x 35.6cm)

RECTANGULAR DUCT PIECES

m

r

o

.

t

F

Straight

m

r

o

.

t

F

)

m

5

4

.

0

(

.t

F

5

.

1

Round Metal Flex - No Bends

m

r

o

.

t

F

)

m

3

(

.t

F

0

1

90° Elbow

m

r

o

.

t

F

)

m

5

.

1

(

.t

F

5

45° Elbow

8” (20.3cm) Round to Rectangular

Transition 90° Elbow

8” (20.3cm) Round to Rectangular

Transition

m

r

o

.

t

F

25 Ft. (7.6m)

Round Wall Cap with Damper

25 Ft. (7.6m)

m

r

o

.

t

F

Round Roof Cap

5 Ft. (1.5m)

m

r

o

.

t

F

10” to 8” Transition

Measure length of Straight

duct and write here

Measure length of Straight

duct and write here

This manual is related to the following products: