: Most filters have their dimensions (e.g., ) printed on the side.
Buying a furnace filter is a straightforward task once you understand the dimensions and the rating system. A clean filter protects your HVAC system from damage, lowers energy bills, and improves the air you breathe. 1. Find Your Filter Size how to buy a furnace filter
: Standard filters are often sold by "nominal size" (rounded numbers), while their "actual size" is typically inch smaller to ensure they fit into the slot. 2. Choose the Right MERV Rating : Most filters have their dimensions (e
The Minimum Efficiency Reporting Value (MERV) tells you how well a filter captures particles. Choose the Right MERV Rating The Minimum Efficiency
Size is the most critical factor; an ill-fitting filter allows dust to bypass the filtration system.
: If the label is missing, measure the length, width, and depth of the filter opening using a tape measure.