Developed by an allergy and asthma physician, AllergyZone Furnace Filters - 4-Pack, carry the manufacturer's Filter Quality Triangle rating of 12, indicating superior performance in three areas crucial to healthy indoor air quality: air flow, efficiency, and holding capacity. AllergyZone filters are 95% efficient at removing small airborne particles that trigger allergy and asthma symptoms, and provide excellent air flow and particulate retention over the life of the filter. AllergyZone high-efficiency filter provides excellent overall performance at a cost of just pennies a day. Replace every 3 months for best performance. Standard 1" thick filters available in six (6) sizes. Sold in packs of 4 filters.
When to Replace the Filter: