Media filter cabinet

[shifrbv]

I have return duct 20x25 with 1" opening at the top to insert/remove standard filter.

Was thinking about upgrading to 5" media filter.

Would you:
a) Install AirBear/Honeywell/Carrier/TotalLine cabinet
or
b) Modify duct, cut additional 4" opening at the top, rivet 4L aluminum brackets for the filter to slide in/out, fab simple cover like.

Thanks,
Brian

[Jultzya]

A

[Wild Leg]

I lean toward the first choice, because there you increase chances of error with field fabrication.
Just adding a couple of rails does not guarantee that the air will actually pass through the filter.

[dash]

I like option b ,if that means you can use a 20X25 media filter,and you put some gaskets on the down stream rails to prevent bypass air.

What size and cfm system?