The Minimum Efficiency Reporting Value (MERV) tells you how well a filter traps particles. MERV Rating Large particles (lint, dust) Protecting the furnace motor only. MERV 5–8 Mold spores, hair, pet dander Standard homes with no pets or allergies. MERV 11–13 Smoke, bacteria, smog Homes with pets, smokers, or allergy sufferers. MERV 14–16 Viruses, fine tobacco smoke Highly sensitive individuals or clinics. 3. Choose Your Filter Material
: Made of polyester or cotton folds. These have more surface area, allowing them to trap more particles without instantly clogging. what furnace filter to buy
A high-end MERV 13 filter that is clogged with dust is worse for your air—and your energy bill—than a clean MERV 8. Experts at Guardian Technologies recommend replacing filters every , or as often as every 30 days during peak heating/cooling seasons or if you have multiple pets. The Minimum Efficiency Reporting Value (MERV) tells you
Your lifestyle dictates the intensity of filtration you need: MERV 11–13 Smoke, bacteria, smog Homes with pets,
: The "nominal" size is a rounded number for marketing; the "actual" size is slightly smaller to ensure a snug fit. 2. Understand MERV Ratings
: The "gold standard," trapping 99.97% of particles down to 0.3 microns. Warning : Most residential systems cannot handle a HEPA filter's air restriction without professional modifications. 4. Tailor to Your Household
