Airflow DV110SE Ventilation Unit filter 2 x G4 and 1 x F7

Airflow DV110SE filter 2 x G4 and 1 x F7 

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.