Air Vent Filter for Home Floor 4"x12" Heater Pre-Filter Sheet Register

ADVANTAGE OF OUR FILTERS Insert our air filter into the air vent registers to purify the air coming from your AC units and heaters. | PACKAGE CONTENTS 12 Pack of 4" x 12" Air Vent Filters for Home Floor. | DIMENSION 4x10 inches. Easily trimmed with scissors to the size you need. Our newest air vent filter has been thickened and its density has been increased by approximately two times, thereby increasing the odor elimination effect by 50%. | COMPATIBLE WITH Floor, wall, ceiling, and baseboard register & grilles in bedrooms, offices, schools, hospitals, or any living space. | REPLACEMENT TIME For best performance, it is recommended to replace the air vent filters every 3-6 months.