Miele Touchtronic T 9800 Instruções de utilização e de instalação - Página 36

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Installation

How to calculate the effective

duct length

The overall duct length will determine

the duct diameter.

^ Measure the actual duct length

needed to go from the dryer's

exhaust connection to the vent outlet:

1. Establish the number of elbows or

bends necessary, noting the type of

bend, angle and radius involved

(see Table).

2. Add the additional duct length (as

derived by using the values

specified in the table) to the actual

duct length to get the effective

length.

Note:

Maximum effective duct lengths:

4" (100 mm) diameter

5" (125 mm) diameter

6" (150 mm) diameter

Effective duct lengths over 66 ft (20 m)

require a larger duct diameter.

Longer ducts may lead to slight

decreases in dryer efficiency if the

necessary duct diameter is not

followed.

66 ft (20 m)

131 ft (40 m)

328 ft (100 m)

Tips about the ductwork

– Check with your local building code

to determine the maximum allowable

duct length.

– Rigid metal or flexible aluminum

ducting is preferred. Flexible foil

ducting may move and bounce due

to the high airflow of the dryer. This

could lead to a thumping or grinding

noise.

– Non-metallic flexible hose should not

be used. It is a potential fire hazard.

– For best drying results avoid extra

long ducting with too many bends,

angles or tight corners.

– The shorter the exhaust ductwork,

the more efficient the dryer will be.

Expelled air is slowed down in the

ducts due to friction against the inner

walls. The shorter and smoother the

inner walls are, the less friction that

will be created.

– An elbow or bend creates more

friction than a straight duct. An

additional duct length factor must be

added for each elbow or bend (see

Table). This factor expresses the

resistance of the bend in terms of a

straight length of duct.

The additional length factor is then

added to the existing duct to give the

effective duct length.

A larger duct diameter helps to

reduce friction. Therefore the duct

diameter and length should be

increased simultaneously.