Hey there
I need to replace the filters on the return ducts of our ducted heat pump system. Can anyone advise me what shops (type and/or specific retailers) sell this stuff (other than the installers themselves - which aren't typically open weekends)?
And, do I need to buy the frame with the filter already fitted, or can (as I intended to) just buy the fabric and refit it in the existing frame? (It's just held in place via the soft plastic tubular stuff that keeps the mesh of a fly screen door in place.)
Edit: for reference, here's an image of a very similar (potentially identical) return duct to the ones we have installed.

Thanks for any advice.
