Best Seller | 11.5X11.5X1 (Actual Size) Accumulair Titanium 1-Inch Filter (Merv 13) (4 Pack) in White | 19 H x 21.5 W x 0.75 D in | Wayfair FI19X21.5A_4 The Accumulair Titanium is the highest efficiency Accumulairfilter on the market. Given an APR 2250 filter rating, this filter is a high-efficiency filter that captures microscopic allergens smaller than 1 micron! This means that this filter removes a... more | | $83.99 $66.99 FREE shipping go to store |