The Aprilaire 4510 Replacement Filter is designed for Models 1700, 1710, 1710A, 1750, 1750A, 1720, 1770 and 1770A. The filter requires annual cleaning or replacement. It is constructed of metal with a foam core.
Get it straight from the source! Genuine Aprilaire replacement parts made by Aprilaire in Poynette Wisconsin U.S.A.