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If your attic ladder door is 24 x 52 our model 25x54 is the correct size. If your attic ladder door is 21 x 52 our model 22x54 is the correct size. If your attic ladder door is 29 x 52 our model 30x54 is the correct size. HOW DOES THE BATTIC DOOR ATTIC STAIR COVER WORK? The Battic Door Attic Stair Cover works like a storm window for your folding attic stairway opening! The gap around your attic stairway is like an open window. In the cold winter your heat flows right out and cold air flows right in; and in the summer your air-conditioning flows right out and the heat flows right in! The Battic Door Attic Stair Cover covers and seals the stairway opening in effect sealing off this area and blocking the transfer of air and moisture. It also helps to prevent the entry of noise attic dust pollutants insulation insects and rodents into the living area from the attic through the drop-down attic stairway door - all while still being easily removed for rapid access to the attic. The Battic Door Attic Stair Cover is installed over thick soft weatherstripping that is attached to the attic stairway frame (not the structural framing of the building or the attic floor). The Battic Door sinks into the weatherstripping and embeds itself into it effectively limiting air leakage between the conditioned house and the unconditioned attic. The Battic Door Attic Stair Cover rests on thick weatherstripping applied to the attic stairway frame - not the structural framing of the house or the attic floor! The Battic Door installs in minutes and no modifications to your attic floor are needed! Other inferior products that rest on the attic floor (which may or may not exist) can require extensive renovations to work - these hidden installation costs can cost you hundreds of $$$! Some other inferior products fail to provide a seal that resists air leakage. Insulation alone cannot reduce air leakage - you must reduce the air transfer between the conditioned and the unconditoned areas. B