594 x 594mm High Efficiency Cardboard Filter (F9)

The 594 x 594mm High Efficiency Cardboard Filter (F9) is an F9-grade high efficiency pleated filter with a rigid cardboard frame, used where finer filtration is needed than a standard G4 panel filter provides. Fits into a standard panel filter housing as a medium-efficiency pre-filter, giving cleaner supply air and helping to protect finer filters or coils downstream.