Ventilation filter boxes
Ventilation filter boxes clean the fresh air brought indoors through ducts. You’ll find multi-stage filter boxes made of galvanised sheet steel with a pre-filter, a fine filter the manufacturer calls HEPA and an activated carbon filter, connected via a round spigot of 10, 15 or 20 cm in diameter.
Ventilation filter boxes
Incoming air passes through three filtration stages. The pre-filter traps coarse dirt such as leaves, fluff or insects and protects the next layers. According to the manufacturer, the fine filter it labels HEPA captures over 95% of small particles, including PM2.5, and activated carbon with silver ions absorbs odours and substances like formaldehyde or nitrogen oxides.
The housing in galvanised sheet steel has a round 10, 15 or 20 cm spigot for connecting to the fresh air supply duct. Four rubber mounts with screws reduce vibration transfer to the structure, and all three filters are included.
The side service door with lever catches gives access to the filters without tools or taking the housing apart. According to the manufacturer, the fine filter should be changed every 3 to 6 months, or about once a month in demanding conditions. Regular checks and maintenance of the inserts keep up the airflow and the efficiency of the whole unit.
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