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Installation instructions, Ductwork calculations, Calculate total equivalent ductwork length – Hotpoint VBXR1060 User Manual

Page 25

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25

Installation Instructions

DUCTWORK CALCULATIONS

Calculate Total Equivalent Ductwork Length

Equivalent

Number

Equivalent

Duct Pieces

Length* x

Used =

Length

6

round

straight

1 ft.

x

( )

=

ft.

3

1

4

x 10

straight

1 ft.

x

(

)

=

ft.

6

, 90°

elbow

15 ft. x

(

) =

ft.

6

, 45°

elbow

9 ft.

x

(

) =

ft.

24

max.

Flexible
Metal Offset
Adapter

34 ft. x

(

) =

ft.

3

1

4

x 10

90° elbow

16 ft. x

(

) =

ft.

3

1

4

x 10

45° elbow

5 ft.

x

(

) =

ft.

3

1

4

x 10

90° flat elbow 18 ft. x

(

) =

ft.

6

round

to 3

1

4

x 10

transition

7 ft.

x

(

) =

ft.

Subtotal Column 1 =

ft.

*Equivalent lengths of duct pieces are based on
actual tests and reflect requirements for good venting
performance with any downdraft cooktop.

† Measure and list feet of straight duct used. Count
and list the quantity of all other duct pieces for the
“Number Used” of each type.

IMPORTANT
For maximum efficiency, use the shortest and straightest
duct run possible, with as few fittings as possible.
For satisfactory performance, the duct run should
not exceed 100 feet equivalent length.

Venting performance is improved by using larger
diameter duct.

Equivalent

Number

Equivalent

Duct Pieces

Length* x

Used =

Length

6

round

to 3

1

4

x 10

transition
90° elbow

20 ft.

x

(

) =

ft.

3

1

4

x 10

to 6

round

transition

5 ft.

x

(

) =

ft.

3

1

4

x 10

to 6

round

transition
90° elbow

12 ft. x

(

) =

ft.

6

round

wall cap
with damper 21 ft.

x

(

) =

ft.

3

1

4

x 10

wall cap
with damper 27 ft.

x

(

) =

ft.

6

round

roof cap

20 ft. x

(

) =

ft.

6

round

roof vent

24 ft.

x

(

) =

ft.

Subtotal Column 2 =

ft.

Subtotal Column 1 =

ft.

TOTAL DUCTWORK =

ft.

Should not exceed 100 feet.

DO NOT use flexible plastic ducting.

Vent installation should not exceed 100 feet
equivalent length.