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HEPA H14 duct filter box with activated carbon for HRV and ventilation systems. The robust welded polypropylene (PP) housing is ideal as a secondary filtration stage installed downstream of a heat recovery unit. It helps reduce fine dust, pollen, aerosols, odors and volatile organic compounds. Available for DN100–315 ducts in insulated and non-insulated versions.
HEPA H14 duct filter box with activated carbon for HRV units and ventilation systems.
HEPA FILTER BOX L CARBON is a robust duct filter box manufactured from welded polypropylene (PP). It is designed for ventilation and heat recovery ventilation systems where a high level of air filtration is required.
The filter box is ideal for installation downstream of a heat recovery ventilation unit as an additional post-filtration stage for supply air. While most HRV units are equipped with G4, M5 or F7 filters, a HEPA H14 filter captures significantly finer particles and helps further reduce dust, pollen, aerosols and other airborne contaminants entering the indoor space.
Inside the box is a combined HEPA H14 + activated carbon filter, which captures fine particles, aerosols and allergens while also helping to reduce odors, smoke and volatile organic compounds.
Unlike common sheet-metal filter boxes, HEPA FILTER BOX L is made from welded polypropylene. PP does not corrode, is highly resistant to moisture and forms an exceptionally durable filter box body.
We use the same manufacturing philosophy for our RECUBOX® units – simple, robust and long-term serviceable construction without unnecessary complexity.
| HEPA filter after HRV unit | suitable as an additional post-filtration stage for supply air |
| Welded PP construction | resistant to moisture, corrosion and long-term operation |
| HEPA H14 filtration | captures fine particles, pollen, aerosols, bacteria and airborne particles |
| Activated carbon | helps reduce odors, smoke and volatile organic compounds |
| DN100 to DN315 | available with different duct connection diameters |
| Insulated and non-insulated versions | basic version, 13 mm synthetic rubber insulation or double-wall version with 30 mm insulation |
Compact welded polypropylene box. The service cover is closed and sealed with screws. This version is suitable for standard installations without increased thermal insulation requirements.
The box is externally covered with a 13 mm layer of synthetic rubber insulation. The insulation helps reduce heat losses and lowers the risk of condensation on the surface of the box. The cover is closed and sealed with screws.
Premium version with 30 mm internal insulation between two PP shells. The service cover is closed using high-quality adjustable toggle latches. This allows quick opening during filter replacement while ensuring reliable sealing.
HEPA FILTER BOX L is designed to make filter replacement simple while maintaining high air tightness. The closure system differs depending on the selected version.
The service cover is tightened around the perimeter with screws. This solution provides firm tightening, high air tightness and a simple construction without moving parts.
The premium double-wall version is equipped with professional adjustable toggle latches. These allow precise adjustment of the sealing pressure and very quick opening of the box without tools.
The double-wall version allows very fast opening of the service cover while also enabling precise adjustment of the sealing pressure.
The installed dual filter combines a high-efficiency HEPA H14 filter with an activated carbon layer. This means it does not only mechanically capture fine particles, but also helps reduce odors and certain gaseous pollutants.
The filter helps capture and reduce:
| fine dust PM2.5 and PM1 | pollen and allergens |
| aerosols and airborne particles | odors and smoke |
| volatile organic compounds | common indoor air pollution |
| Filter type | Dual Filter – HEPA H14 + activated carbon |
| Certification | HEPA H14 |
| Filter dimensions | 337 × 360 × 42 mm |
| Filter weight | 0.63 kg |
| Recommended service life | 8–12 months |
| Compatibility | HEPA FILTER BOX L |
| Box dimensions without insulation | 357 × 380 × 300 mm |
| Filter dimensions | 337 × 360 × 42 mm |
| Connection diameters | DN100, DN125, DN160, DN200, DN250, DN315 |
| Box material | welded polypropylene PP |
HEPA FILTER BOX L has been tested for pressure loss at different airflows. The measured values help with correct fan selection and with assessing suitability for a specific installation.
HEPA filter pressure loss graph:
The filter box is suitable for installations where the quality of filtered air needs to be improved beyond the standard level of G4, M5 or F7 filters.
| Downstream of an HRV unit | additional HEPA filtration of supply air for maximum indoor air quality |
| Family houses and apartments | fine filtration of supply air, protection against dust, pollen and odors |
| Offices | improved air quality in the working environment |
| Bedrooms and children’s rooms | higher comfort for allergy sufferers and sensitive people |
| Rooms with odor load | activated carbon helps reduce odors, smoke and selected VOC substances |
The product card also includes a technical leaflet with an overview of the key properties of the filter box.
HEPA FILTER BOX L CARBON combines high HEPA H14 filtration efficiency, the odor-reducing effect of activated carbon and the advantages of welded PP construction.
The result is a durable, easy-to-service and long-lasting duct filter box, especially suitable as an additional filtration stage downstream of a heat recovery ventilation unit.
Data sheet
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HEPA H14 duct filter box with activated carbon for HRV and ventilation systems. The robust welded polypropylene (PP) housing is ideal as a secondary filtration stage installed downstream of a heat recovery unit. It helps reduce fine dust, pollen, aerosols, odors and volatile organic compounds. Available for DN100–315 ducts in insulated and non-insulated versions.
