Air Box 4+ Pre-Filter special-order Perfect for a 4' x

Perfect for a 4' x 4' growing area at 24”

Clinically designed with ample space

corrosion and are BPA free

mature trees benefit from regular pruning to support strong branch structure and consistent fruiting

Air Box 4+ Pre-Filter special-order Perfect for a 4' xDescription Replacement Pre filter for the Airbox 4+: This item is a replacement pre filter designed specifically for use with the Airbox 4+. It's recommended to replace this pre filter every 3 months in order to ensure optimal performance and efficiency. Measurements: The dimensions of this pre filter are 19 in. x 16 in. x 1 in., making it conveniently sized for easy installation and replacement. Specifications Quantity: 1 Weight: 0. 20 lb Width: 16.