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
: 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 what furnace filter to buy
: Made of polyester or cotton folds. These have more surface area, allowing them to trap more particles without instantly clogging. The Minimum Efficiency Reporting Value (MERV) tells you
Different materials offer varying levels of filtration and durability. MERV 11–13 Smoke, bacteria, smog Homes with pets,
: If you use a 1-inch filter in a slot designed for 4-inch filters, it will leak air and bypass filtration. Filterbuy notes that incorrect thickness can degrade air quality and strain your system.
: MERV 8 is the sweet spot for most households. It provides solid filtration without stressing the motor .
: MERV 11 is recommended for multi-pet homes or those with seasonal allergies, as it captures finer dander and pollen.