Airflow DV96SE Ventilation Unit filters 2 x G4 and 1 x F7 material

Airflow DV96SE filter 2 x G4 and 1 x F7 material 

G4 filters are of courser grade and designed to prevent insects, leaves and other small debris from entering the home. F7 Filters are fine grade and designed to capture small and often invisible particles such as pollen spore, bacterium and dust.