When it arrived it was the wrong size, too big to fit my Nutone central vacuum! It was easy to go back and get my money back it's just a waste of time!
Perfect fit for my old Nutone CV-350W, it wasn't too big like some reviews claimed. Works well and the rubber on the inner rim makes it easy to ensure a secure fit.
This is not a genuine Nutone filter as described. That's common. It does not fit. The outer ring is heavier and a few millimeters larger than the original. It won't fit in the canister no matter how hard you try to force it. Waste of time and money!
As I said in the previous answer, the circumference of the filter was 1/2 inch larger than the frame it was meant to fit. I had to cut and remove 1/2 inch of the metal rod frame to make it fit. There was no reply to the last email.