Insulated Filter Housings

17.5" x 21" for a 16" x 20" Filter

18.5" x 21" for a 16" x 20" Filter

21" x 21" for a 18" x 20" Filter

21.5" x 21" for a 20" x 20" Filter

23.5" x 21" for a 22" x 20" Filter

24.5" x 21" for a 22" x 20" Filter

26.5" x 21" for a 25" x 20" Filter

14" x 22" for a 12" x 20" Filter

14.5" x 22" for a 12" x 20" Filter

15.5" x 22" for a 12" x 20" Filter

17.5" x 22" for a 16" x 20" Filter

18" x 22" for a 16" x 20" Filter

18.5" x 22" for a 16" x 20" Filter

19.5" x 22" for a 18" x 20" Filter

20" x 22" for 18" x 20" Filter

21" x 22" for a 18" x 20" Filter

21.5" x 22" for a 20" x 20" Filter

22.5" x 22" for a 20" x 20" Filter

23.5" x 22" for a 22" x 20 Filter

24" x 22" for a 22" x 20" Filter

24.5" x 22" for a 22" x 20" Filter

25" x 22" for a 22" x 20" Filter

22" x 24" for a 20" x 22" Filter

22" x 26" for a 20" x 25" Filter

14" x 28" for a 12" x 25" Filter

17.5" x 28" for a 16" x 25" Filter

21.5" x 28" for a 20" x 25" Filter

24.5" x 28" for a 22" x 25" Filter

14.5" x 29" for a 12" x 25" Filter

17.5" x 29" for a 16" x 25" Filter

21.5" x 29" for a 20" x 25" Filter

24.5" x 29" for a 20" x 25" Filter