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printman
These filters have a 1 inch "header" on a 4 or 5 inch filter. They fit into drop down filter grills. One is made by Honeywell. Another one is called the Practical Pleat. Both have...

I can't argue with the logic that the system should be tested. But I don't think this is practical for most home owners. (but it should be a part of every pm contract)

Both the 1" fiberglass...

I can't argue with the logic that the system should be tested. But I don't think this is practical for most home owners. (but it should be a part of every pm contract)

Both the 1" fiberglass...

A 4" MERV 11 would not be too restrictive. Available many places on the internet.

I would be leary of a MERV 12 but would have to see the test results.

Using a commercial 4" filter is a good option. Most of these come in a MERV 7. This will give you good filtration, better indoor air quality and will not restrict air flow to any great degree. My...