Thermador VCIN36JP Installation Manual download pdf (Page 9)

English 7

Ductwork Preparation

Ducting Recommendations

Proper performance is dependent upon proper ducting.

Local building codes may require the use of make-up air

systems when using ducted ventilation systems greater

than speci¿ed cubic feet per minute (CFM) of air

movement. The speci¿ed CFM varies from locale to locale.

It is the responsibility of the owner and the installer to

determine if additional requirements and/or standards

apply to specific installations.

DO NOT USE FLEXIBLE DUCT; it creates back pressure/

air turbulence and reduces performance. Always use metal

ductwork with a minimum diameter of 6” (150 mm).

Always install a metal vent cover where the ductwork exits

the house.

COLD WEATHER installations should have an additional

backdraft damper installed to minimize backward cold air

flow and a nonmetallic thermal break to minimize

conduction of outside temperatures as part of the ductwork.

The damper should be on the cold air side of the thermal

break. The break should be as close as possible to where

the ducting enters the heated portion of the house.

MAKE-UP AIR: Local building codes may require the use

of make-up air systems when using ducted ventilation

systems greater than specified CFM of air movement. The

specified CFM varies from locale to locale. It is the

responsibility of the owner and the installer to determine if

additional requirements and/or standards apply to specific

installations.

For safety reasons, ducting should vent directly outdoors

(not into an attic, underneath the house, into the garage or

into any enclosed space). The unit cannot be used in

conjunction with a recirculation unit.

If using a 10" (254 mm) duct, THERMADOR

recommends

not exceeding 150 ft (46 m) of duct.

Keep duct runs as short and straight as possible. Elbows

and transitions fittings reduce air flow efficiency. Back to

back elbows and “S” turns give very poor delivery and are

not recommended.

A short straight length of duct at the inlet of a remote

blower gives the best delivery.

Hoods are supplied with a 10" (254 mm) round transition. A

locally supplied transition is required for other sizes.

Transitions, elbows and wall or roof caps are all factors that

will add more static pressure, therefore increasing your

equivalent duct run. For example, assume you have 30 ft

(9.2 m) of straight 10" (254 mm) duct with two 90° elbows

and an outside wall cap. To calculate the equivalent

straight duct run pressure, you would add 12 ft (12.7 m) for

each elbow, and 5 ft (1.5 m) for the outside wall cap,

increasing your equivalent total run from 30 to 59 ft (9.1 to

17.9 m).

Use Table 4 on page 8 to compute permissible lengths for

duct runs to outdoors.

NOTE:

Do not exceed maximum permissible equivalent lengths.

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Thermador VCIN36JP Installation Manual Page 9

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