The high-airflow duct filter is designed to use activated carbon to eliminate odours and chemicals, popularly used for hydroponics, grow rooms, kitchens, smoking areas, and other ventilation projects. Features premium-grade Australian Virgin charcoal bed. The filter can be used in conjunction with an inline duct fan to act as both intake and exhaust configuration. Heavy-duty construction contains aluminium flanges and dual-sided galvanized steel mesh. The ..