HCY Washable Aluminum Air Filter MERV 8 vs MaxMERV9 Washable Furnace Filter

These are both washable electrostatic furnace filters, but they are not the same size, so fit decides first. The HCY is a nominal 20x20x1 aluminum filter rated MERV 8, aimed at standard residential and light commercial returns. The MaxMERV9 is a 10x25x1 filter rated MERV 9 with published test figures and a sturdier aluminum frame with a corrugated grid. Owners of the MaxMERV9 praise dust capture and easy cleaning, though some report dented arrivals and a lighter feel than older versions. Buy the one that matches your filter slot.

• Choose the HCY if your return takes a 20x20x1 filter and you want a simple washable aluminum panel rated MERV 8.
• Choose the MaxMERV9 if your slot is 10x25x1 and you want the higher MERV 9 rating with a reinforced frame.