how to measure return vent filter slot 25x28x1

How to Measure Your HVAC Filter Slot for a 25x28x1 Filter

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Master Your Fit: Measuring for a 25x28x1 HVAC Filter.' It illustrates four steps to accurately measure the width (25 inches), length (28 inches), and thickness (1 inch) of a furnace filter slot."

If you’re shopping for a 25x28x1 HVAC filter but aren’t sure it’ll fit your system, you’re already ahead of most homeowners — because the “size on the box” doesn’t always match the actual opening inside your unit. At AtticKnowHow, we’ve seen filters get jammed, bow, or leak air simply because the slot measurement was off … Read more