Same MERV 13 electrostatic pleated media as the 6-pack, in a smaller-quantity box. Captures particles down to 0.3 microns and is graded for residential allergy and smoke-filtering use. The 14x20x1 size fits older home systems and some vent returns.
Four filters covers about a year of normal changes (every three months) for most homes, or six months for families that change at the recommended monthly interval. Useful for first-time MERV 13 upgraders who aren’t ready to commit to bulk.
BNX manufactures TruFilter in the United States.
