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When to change the dustbag

Change the dustbag when the colored

marker in the airflow indicator fills the

display.

The dust bags are disposable and

intended to be used only once. Do

not attempt to reuse.

Checking the airflow indicator

Perform this test with the SBD 450-3

floor tool only, since other attachments

can affect the function of the airflow

indicator. If your vacuum cleaner is

equipped with the SBB 300-3, the test

cannot be performed.

^ Attach the floor tool to the vacuum

cleaner.

^ Turn the vacuum cleaner on and

select the highest power setting.

^ Lift the floor tool slightly off the floor.

If the marker completely fills the

indicator window, the dust bag needs

to be changed.

Maintenance and care

How the airflow indicator works

The airflow indicator is designed to

show when the bag is full of common

household dust and to measure the

amount of air flow through the dustbag.

Normal household dust is a mixture of

dust, hair, carpet fluff, threads, sand,

etc.

However, if fine dust, such as drill dust,

sand, plaster or flour is vacuumed, the

pores of the dustbag will become

blocked. The marker will indicate that

the bag is "full" even when it is not. The

dustbag should be changed because

the suction power is greatly reduced.

If the bag is bulging with pet fur, hair,

carpet fluff, etc., the indicator may not

flow of the dustbag may still be high

enough not to activate the marker to

show maximum. The dustbag should

still be changed.