The MERV rating is 8. That is considered to be a “good” rating. A rating of 9-12 is best for residential uses.
You could cut a 20 x 14 down and tape up the cut end, or just let it stick out, or maybe bend the excess over. It's not critical that it fit perfectly.
I do not know. Try their web site. They may have available sizes
Not sure but website on package might work. Www. Protectplusair.com
DON'T BUY THESE, THEY ARE NO GOOD.
Have not seen any 4 inches thick
We will advise when product has been re-stocked; however, no sales price at this time.
If it is an ON LINE order, there are NO rainchecks. It is quantity on hand. If at store, you can get a raincheck as long as it does not say quantities limited.
I think all sizes are available. I would call the store to see.
Probably the lowest. Very flimsy. I won't buy again.