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25
,QVWDOODWLRQ,QVWUXFWLRQV
D8&7:25.&$/&8/$7,216
&DOFXODWH7RWDO(TXLYDOHQW'XFWZRUN/HQJWK
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
6” round
straight 1 ft. x ( )
†
= ft.
3
1
ø4” x 10”
straight 1 ft. x ( )
†
= ft.
µ
elbow 15 ft. x ( ) = ft.
µ
elbow 9 ft. x ( )
= ft.
24” max.
Flexible
Metal Offset
Adapter 34 ft. x ( )
= ft.
3
1
ø4” x 10”
HOERZ IW [ IW
3
1
ø4” x 10”
HOERZ IW [
= ft.
3
1
ø4” x 10”
IODWHOERZ IW [
= ft.
6” round
to 3
1
ø4” 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.
,03257$17
For maximum efficiency, use the shortest and straightest
duct run possible, with as few fittings as possible. )RU
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H[FHHGIHHWHTXLYDOHQWOHQJWK
Venting performance is improved by using larger
diameter duct.
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
6” round
to 3
1
ø4” x 10”
transition
HOERZ IW [ IW
3
1
ø4” x 10”
to 6” round
transition 5 ft. x ( ) = ft.
3
1
ø4” x 10”
to 6” round
transition
HOERZ IW [
= ft.
6” round
wall cap
with damper 21 ft. x ( ) = ft.
3
1
ø4” x 10”
wall cap
with damper 27 ft. x ( ) = ft.
6” round
roof cap 20 ft. x ( ) = ft.
6” round
roof vent 24 ft. x ( ) = ft.
Subtotal Column 2 = ft.
Subtotal Column 1 = ft.
727$/'8&7:25. ft.
Should not exceed 100 feet.
'2127XVHIOH[LEOHSODVWLFGXFWLQJ
Vent installation should not exceed 100 feet equivalent
length.
• Sufficient air is needed for proper combustion and
exhausting of gases through the flue (chimney) of
fuel burning equipment to prevent back drafting.
Follow the heating equipment manufacturer’s
guideline and safety standards such as those
published by the National Fire Protection Association
(NFPA), and the American Society for Heating,
Refrigeration and Air Conditioning Engineers
(ASHRAE), and the local code authorities. When
applicable, install any makeup (replacement) air
system in accordance with local building code
requirements. Visit *($SSOLDQFHVFRP for available
makeup air solutions.
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