My wife and I just purchased / moved into a new house and I was going through each of the systems and found the HVAC filter, it was literally destroyed (it had filled with crap and crushed itself in half. So essentially we had no filter.).
So I want to replace obviously, and reading up on filters it seems a MERV 11 or 13 would be perfect, I was also reading that a thicker filter can work better while not impacting air flow as much, so I was hoping to go with something in the 4"-5" range like this.
So I open that up, and find the broken down filter, which is marked as 20x20x1. However I have a feeling that either one or both of these are true: 1. They used the wrong type of air filter 2. I can use a thicker air filter
Reasons being: - the actual hole going into the furnace is 10" H x ~19.5" W - There is a (what I assume is retention tab) tab about 5.25" off the hole wall, making me think that I can use a filter of ~5" depth.
( It's carrier
My questions then are: 1. What size filter should I be using? 2. And is a thicker filter best for this setup?
I really appreciate any help! Scratching my head on this one.