GeneralAire AC-1 Replacement Air Filters, MERV-11

Generalaire 4001 12758 Replacement Micro-Fiber “No-Tear” expandable MERV 11 High Efficiency Media Air Filter Max Expanded Length: 25-1/4 (inches) Max Expanded Height: 19-1/4 (inches) Approx. Collapsed Height: 3-1/4 (inches) Approx. Collapsed Width: 6-1/4 (inches) Fits Models: GeneralAire AC22, AC1 and AC3, Source 1 Model S1-MAC11202506, Carrier 31M020100 and Bryant 902BXX020, Bryant 902BX; Carrier 31MF020, 31MF120; Source 1 S1-MAC11202506, S1-FM11202506

• Rated MERV 11, this expandable microfiber filter efficiently captures airborne particles like dust, pollen, pet dander, and mold improving indoor air quality in whole-home systems.
• Designed to fit GeneralAire AC‑1 and AC‑22 whole-house air cleaners (also compatible with Bryant 902BX, Carrier 31MF series, Source 1 units, and more), ensuring broad OEM compatibility.
• Features accordion-style media that expands to fill your reusable plastic frame while reusing existing pleat spacers for maximum surface area and airflow efficiency.
• Recommended replacement is every 6 months for dual heating and cooling use, or 12 months for heating-only systems; in dusty environments or homes with shedding pets, more frequent changes may be necessary.