Air filters for ducts inside coach

[KC Snellgrove]

GOOD DAY FELLOW BEAVERS!

What type and where can I purchase air filters should we use inside our coach roof ducting?

THANK YOU ALL, that is it for today.

[Stan Simpson]

I just buy two mesh type 20 x 20 x 1 filters, and then cut them down to 14 x 14 so they will fit. Even then, the electrical box in the front one interferes and I have to do a little modification. For sure 14 x 14 x 1s that you can buy will not fit because of the paper border around the material.

[KC Snellgrove]

THANK YOU! 

[Roy Warren Co-Admin]

I buy window air conditioner unit filters and cut them down.   
Roy Warren