If the filter is missing or unreadable, check your indoor unit’s manual for the required dimensions.
Carrier units can accommodate various filter materials, each with a different rating. Higher MERV ratings indicate better particle capture. Filter Type Typical MERV Replacement Cycle Fiberglass Basic protection; budget-friendly. Pleated General home use; traps dust, dander, and pollen. 3–6 months High-Efficiency Best for allergies; captures fine particles and bacteria. Up to 1 year buy carrier ac filters
Look at the side of your current filter; the nominal size (e.g., 20"x25"x1") is usually printed there. If the filter is missing or unreadable, check