Filter box - All industrial manufacturers
DIY Box Fan Air Cleaner Update - Energy Vanguard
HVACQuick - HVACQuick CFB Series MERV-13 Inline Filter Boxes
Blower Filter Box - Allegro Industries
Air Box Filter - High flow, activated carbon filter
AC Infinity Inline Filter Box 4" with High Efficacy Filter, Whole House HVAC Filtration Kit, Fits 4-Inch Inline Duct Fans for Fresh Air Intake and Ventilation
HVACQuick - Filter Boxes
Fantech FB 6 In-line Filter Box w/MERV 12 Filter 6" Duct - Replacement Furnace Filters - Amazon.com
In-Line filter Box - Greentek
HVACQuick - HVACQuick CFB-HP Series HEPA Inline Filter Box
A Variation on the "Box Fan with MERV 13 Filter" Air Cleaner - Tex-Air Filters
Master Flow 12 in. x 20 in. x 12 in. Return Air Filter Box RA12X20X12 - The Home Depot
Air Box Filter - High flow, activated carbon filter
9500-34 Allegro Industries Blower Filter Box with Filter
UGF Box
DIY box fan filters – Corsi-Rosenthal box - Clean Air Crew
PM2.5 Air Filter Box Inline HEPA Filter for Commercial and Home HVAC - Air Purifying Unit - BRESPALIN CO., LTD.
Air Filter Housing - Advance Auto Parts
Air Filter Housing - Advance Auto Parts
