Protect your furnace and central air conditioner with the Flanders EZ Flow II 10" x 20" x 1" flat panel fiberglass air filter, trusted for over 50 years in residential and appliance applications. This disposable filter features a continuous filament spun glass filtering medium and a sturdy, one-piece chipboard frame to help prevent corner separation. Designed for effective dust and lint capture, this 10x20x1 filter is ideal for maintaining peak HVAC system performance and energy efficiency. For best results, replace your filter every 30 days during periods of high use. The MERV 4 rating ensures reliable filtration for everyday needs. Each case includes 12 filters, making it easy to stay prepared throughout the year. Compatible with most standard furnace and AC filter slots, this 10x20x1 air filter is a great choice for those seeking dependable, easy-to-install replacement furnace filters. No metal media retainers are used, and no batteries are required. Choose Flanders for consistent air quality and equipment protection.