Size is the most critical factor; an ill-fitting filter allows dust to bypass the filtration system.
: Most filters have their dimensions (e.g., ) printed on the side. how to buy a furnace filter
The Minimum Efficiency Reporting Value (MERV) tells you how well a filter captures particles. Size is the most critical factor; an ill-fitting
: 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 Size is the most critical factor