Hello, CW! Thank you for your feedback. I'd like to apologize for the inconvenience you have experienced. Our DuPont Platinum is a MERV12 filter. The higher the MERV rating, the greater the particle capture rate. By ASHRAE standards, a MERV 10 filter will capture 50% or greater of particles with a size of 1.0-3.0 microns and 85% or greater of particles with a size of 3.0-10.0 microns. By ASHRAE standards, a MERV12 filter will capture 80% or greater of particles with a size of 1.0-3.0 microns and 90% or greater of particles with a size of 3.0-10.0 microns. Generally speaking, the higher the MERV rating, the higher the pressure drop. It sounds like your unit is compatible with a MERV10 vs. a MERV12 filter. As with any product, compatibility is key to functionality. Have you checked your HVAC owner's manual for recommendations? We offer a wide range of DuPont pleated filters with a lesser MERV. If you have any additional feedback or have further questions, please feel free to reach us toll-free at 888-808-9100. - Meghan, DuPont, manufactured under license by ProtectPlus