What does this cover actually do?

It covers the CleanShield HEPA 550 air scrubber to keep dust and debris off the housing and controls while the unit is stored or moved. It is not a filter and does not change how the scrubber cleans air.

Will it fit other air scrubbers?

It is made for the AlorAir CleanShield HEPA 550. AlorAir does not present it as a universal cover, so check that you own that model before buying.

Does it affect airflow or filtration?

No. It goes on when the scrubber is idle. The machine's filters and fan do the air cleaning, and the cover plays no part in either.

Can I run the scrubber with the cover on?

No. A dust cover is for storage and transport, and the scrubber needs its openings clear to move air. Take the cover off before you switch the unit on.

Is it worth adding for a job-site scrubber?

If the unit rides in a truck or sits in a dusty shop between jobs, the cover keeps grit out of the housing and controls. If the scrubber stays running indoors, it adds little.