MERV 8 Pre-Filter (3 Pack) **Fits Old Model FFU - FloCube

19x20x5 replacement whole house air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.06 x 19.81 x 4.25)

Filterbuy 19x20x5 Air Filter MERV 8 Dust Defense (1-Pack), Pleated HVAC AC Furnace Air Filters for Bryant/Carrier FILXXFNC0021, Day & Night, and Payne

FloCube® ProFlow™ 23 2x3ft Flow Hood - FloCube

FloCube Shop - Mushroom Cultivation Equipment

AAF Flanders PREpleat LPD MERV 8 Standard Capacity Filters - Custom Si

MERV 8 Pre-Filter (3 Pack) **Fits Old Model FFU

The Official Fan Filter Unit(ffu) thread of power - Mushroom Cultivation - Shroomery Message Board

Bonsai 3 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V

Bonsai 3 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V

3x4ft FloCube Laminar Flow Hood with H14 HEPA Filter 99.999% @ 0.3 microns - FloCube