What is the difference in the 401 and 501 media filters and why cant you use the 401 in th model 5000?

Consumer question:

What is the difference in the 401 and 501 media filters and why cant you use the 401 in th
model 5000?

Aprilaires’ response:

The 401 and 501 filters are the same size, but the 501 has mettalic stripping on each crease.  This stripping is necessary in with the electronic make up of the model 5000 air cleaner.  You could use the 401 filter in the model 5000 electronic air cleaner, but if you do, you will not be able to utilize the electronic capabilities of the unit.

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