Panasonic’s WhisperSupply-Wall fans meet ASHRAE 62.2 requirements for make-up/supply air. Easy to install in both new construction and retrofit applications, the WhisperSupply-Wall FV-01WS1 and FV-04WS1 are ideal for temperate climates. The fans take air from the outside and filter it through a Merv 8 filter to supply clean air into the home. The wall-mounted models are equipped with an interior deflector that pushes airflow up and around the walls to avoid unwelcome drafts and assist with homeowner comfort.