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Option 3 - Combination System

The combination system may be used in high-rise apartments,

with a bank of dryers installed at several different levels. Each of

these banks then exhausts into a central vertical vent. See the

following illustration for an example of a combination system.

A. Central vertical duct - maximum of

0.1" (2.5 mm) water column vacuum

B. Weighted damper (each dryer)

C. Maximum back pressure measurement

location

D. Barometric damper (use depends on

exhaust system design)

E. Outside air source

DRYER INSPECTION

AND CLEANING

Frequency of Exhaust System Cleaning

Every exhaust system must be inspected periodically and cleaned

to ensure that it is intact and free from lint accumulation. The

frequency of these inspections will vary, depending on the system

and usage of the dryer. For single-family usage, an annual

inspection is recommended. In commercial usage or in multiple

dryer systems, a more frequent inspection is recommended.

Complaints of long drying times or a hot dryer top indicate the

need for inspection of the exhaust system.

Inspecting the Exhaust System

1. Disconnect the exhaust duct from the dryer and from the

exhaust hood (at the exhaust outlet) outside of the building.

2. Inspect the interior of the duct and remove any lint

accumulation.

■

Be sure that lint is removed from the exhaust hood. Lint

may collect in the exhaust hood so that the flappers or

louvers will not open or close completely.

■

After cleaning the exhaust hood, check that the flapper or

louvers move freely.

3. Reassemble the exhaust duct and hood, checking that the

joints are secure.

4. Operate the dryer and verify that the exhaust air is not

obstructed in the vent and that there are no leaks in the

system.

■

Seal any leaks found.