Trimbox NO2 Filter®

Trimbox NO2 FilterTrimbox NO2 FilterThe Titon Trimbox NO2 Filter® reduces Nitrogen Dioxide (NO2) which is predominantly produced by exhaust gases from diesel engines.

Due to this pollution arising in cities and urban areas there is a need to implement mitigation measures to improve the indoor air quality (IAQ). The Trimbox NO2 Filter® is an effective means of reducing high NO2 to an acceptable mean annual concentration level of 40µg/m3.

Features & Benefits

  • Effective in reducing pollutants in the home, improving Indoor Air Quality (IAQ) and reducing the risk of Toxic Home Syndrome
  • Low pressure drop
  • Low cost
  • Optional F7 filter can be installed to further improve IAQ
  • Compact design
  • Compatible with Titon’s range of MVHR units
  • Fully lined box to reduce duct bound noise and condensation
  • The unit can be installed in both intake air and supply ducting
  • Fitted with either 3 or 4 active carbon filters  
  • F7 filter reduces up to 95% of PM2.5 particles
  • G4 filter reduces 100% of PM10/35% of PM2.5 particles
  • 98% NO2 reduction at pre filter concentrations of ≈ 200μg m³
  • Effective silencer
  • Third party tested for both NO2 and Acoustic reductions.




HouseBuilder Product Awards 2016 Winner


Trimbox NO2 filter






HRV10 Q Plus dimensions




Product Code

Unit One:
TP550 220 x 90 TP552 Ø160 TP554 Ø150

Unit Two:
TP551 220 x 90 TP553 Ø160 TP555 Ø150 

Behind unit duct mounting kit - TP558


Conforms to the EU Directive 2008/50/EC (the CAFÈ Directive) and to The Building Regulations Part F.

Testing Kits

Nitrogen Dioxide Rapid Air Monitor Testing Kits are available to purchase directly from Gradko International or contact via email or call +44 1962 860 331.


Dimensions: 350mm wide x 690mm high (excluding ports) x 205mm deep
Port Dimensions: Rectangular: 220mm x 90mm
Round: Ø150 and Ø160
Finish: White Paint
Materials: Housing: Zintec sheet steel housing, powder coated white.
Internals: Zintec sheet steel Pre-Filter: Grade G4 synthetic filters as standard, F7 optional.
Active Carbon Filter: Honeycomb matrix constructed filter filled with granular active carbon.
Internal insulation: Closed cell foamed nitrile rubber, class ’O’ fire rating.
Installation: Install in accordance with Good Practice, such as the Domestic Ventilation Compliance Guide (England & Wales) and the Residential Ventilation Association recommendations.
Maintenance: Service and filter cleaning/replacement subject to local environment - see product manual.
Accessories: Rectangular to round duct connections.
Replacement pre-filters and active carbon filters

More information / 01206 713800