Inline Filter Boxes

Inline filter boxes sit directly in a run of circular ducting and filter the air passing through it — protecting fans, heat exchangers and valves from dust, and keeping ductwork clean. Each unit is supplied complete with EU3 filter media, and the box design makes the media easy to access and replace when it loads up with dust.

They are commonly installed ahead of inline fans and heat recovery units, on supply air intakes, and in extract systems where dust would otherwise build up in the ductwork.

We stock six duct diameters: 100, 125, 150, 200, 250 and 315mm, with spigots sized to connect straight into standard circular and spiral ducting.

Pair an inline filter box with one of our inline duct fans for a clean, quiet ducted ventilation setup, or see G4 pleated panel filters for AHU and housing replacements. Order by 3pm for next-day delivery on stocked sizes, and get free UK mainland delivery on orders over £400 ex VAT.