Miele T 7634 Operations Instructions download pdf (Page 39)

Calculating the total duct

length :

Friction against the inner walls of the

ducting will slow down the expelled air

as it passes through. An elbow, bend,

non-return flap or wall vent creates

more friction than a straight duct. The

friction created by each of these is

expressed as an additional duct

length factor. The additional length

factors are calculated by comparing

the friction created by, for example, an

elbow to that created by 1 metre of

straight plastic piping (Table I).

The additional duct length factor for

each item needs to be added together

to ascertain the total duct length

required.

A larger internal duct diameter also

helps reduce friction. If the total duct

length is more than 20 m the duct

diameter should be increased (Table

II).

1. To calculate the total duct length

required:

^

First measure the distance which will

require straight ducting

. Multiply this

amount by the corresponding

additional duct length factor in Table I.

^

Establish the number of angles,

bends etc. necessary and add their

additional duct length factors

together with the help of Table I.

^

Add all the additional duct length

factors together to get the total duct

length.

2. Internal duct diameter

^

Refer to Table II for the appropriate

duct diameter required.

Table I

Additional

duct length

factor

Flexible ducting*

–

1 m laid straight

–

45° angle

(Bend radius = 0.25 m)

–

90° angle

(Bend radius = 0.25 m)

1.8 m

1.5 m

2.5 m

Flexible aluminium vent hose* / plastic

piping

–

1 m laid straight / or 1 m

straight pipe

–

45° angle / elbow

(Bend radius = 0.25 m)

–

90° angle / elbow

(Bend radius = 0.25 m)

1.0 m

0.6 m

0.8 m

Wall vent kit* or window vent kit*

–

with louvred grille

–

with non-return flap (hinged

flap)

3.8 m

1.5 m

Non-return flap* to be

integrated into the vent

ducting

14.3 m

Flat ducting (for washer dryer

stack)*

11.0 m

Venting connection to the

left/right

1.0 m

*optional accessory from Miele

Table II

Maximum total

duct length allowable

Internal duct

diameter required

20 m

40 m

100 m

100 mm

125 mm

150 mm

Installation - venting

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