Wolf VU24S Manual do Utilizador descarregar pdf (Página 8)

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Step 1: Determine the Duct Run

IMPORTANT NOTE: Consult a qualied HVAC professional

for specic installation and ducting applications.

Check local codes: Consult a qualied HVAC professional

to ensure all applicable codes are followed. Refer to the

installation guide for your specic Wolf ventilation product.

Minimize the duct run: The length of the duct run and

number of elbows and transitions can have a signicant

effect on ventilation performance. Keep the duct run as

short as possible and limit the number of elbows and transi-

tions. Do not use exible metal ducting.

Elbows and transitions: Do not place elbows and transi-

tions back-to-back. Whenever possible, include a minimum

15"

(381) straight ducting between elbows and transitions to

increase ventilation performance.

Use recommended duct sizes: Depending on the specic

ventilation product, Wolf recommends 6"

(152), 8" (203), or

10"

(254) ducting. Smaller duct sizes will signicantly reduce

ventilation performance.

Cold weather installations: Cold weather installations may

require an additional backdraft damper to minimize back-

ward ow of cold air. All Wolf ventilation hoods, except

low-prole wall hoods, come with a backdraft damper con-

nected to the transition. Downdraft systems do not have a

backdraft damper.

High altitudes: Ventilation systems are less effective at

altitudes above 5,000'

(1524 m). At these altitudes, you

should estimate a 20–25% reduction in CFM performance.

A higher CFM blower and increasing the duct size is

recommended.

Make-up air: Make-up air may be required to replace air

removed by the ventilation system. Consult a qualied

HVAC professional for specic applications.

DETERMINE THE DUCT RUN

Equivalent duct length: Determine the equivalent length of

the duct run using the equivalent duct lengths for com-

monly used ducting listed in the chart on the following

page. Follow these steps and use the chart to calculate the

equivalent duct length:

1 Compute the length of all straight ducting.

2 Compute the equivalent duct length of all elbows,

transitions and caps.

3 Add equivalent lengths for all sections of the duct run.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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