Changing the PP 45 air filter

Remove the cover.

Separate the bus line.

Pull slide-in module, on pull-out bracket, out of the wall sleeve. Make sure that the slide-in module is pulled cleanly past the shutter.

Change front air filter.

Change rear air filter.

Push the slide-in module back into the wall sleeve and connect the bus line.

Hook the cover at the top of the housing and swing it downwards until it engages in the housing.