Vent cap cover allows you to leave your vent open rain or shine, on the road or stationary. Allows constant ventilation while camping or in storage, no mold or mildew in closets. Easy-to-open front grill allows for cleaning of debris from vent. Easy to install on any standard 14" X 14" roof vent, includes all mounting hardware. For use on high-volume fan vents, we recommend removing the screen in the vent cover.