MERV 13 Aprilaire Space-Gard Replacement
This replacement filter appears to be well made.  I can't tell how good the filtering medium is. Whether it filters as well as the original or whether it impedes the flow of air.<br /> What I do know is that it is much easier to install than the original filters with the three combs which broke after only two seasons and they are less expensive.
Rating: 4 stars