Proventia DPF & DOC systems

PROAIR® Diesel Particulate Filters

NOxBUSTER® systems often include a diesel particulate filter. The same DPF systems are available also as stand-alone PROAIR® filters. Proventia PROAIR® filters are reliable, user-friendly retrofit solutions that can be applied to a wide variety of commercial vehicles like buses and trucks, but also to non-road machines. The PROAIR®MR (Muffler Replacement) systems are install-ready systems to the most common vehicle makes and models. PROAIR® Flex systems that have a unique modular design with multiple installation options.

PROAIR Flex DPF system
PROAIR Muffler Replacement DPF
PROCAT DOC for heavy-duty machine

How does it work?


The PROAIR® Filter's precious-metal-coated wall-flow filter collects particulate matter and also reduces HC and CO emissions. World-leading coating technology guarantees a one-of-a-kind purification performance with over 90% PM reduction and long-term chemical durability. Once the exhaust gas has reached an adequate level for regeneration, the collected PM is oxidised. PROAIR® diesel particulate systems regenerate continuously during regular vehicle operation, which means long maintenance intervals and minimum downtimes for machines. PROAIR® Filters are always accompanied with a PROCARE™ Datalogger that continuously checks the backpressure for proper regeneration performance and informs the driver when the remaining ash needs to be cleaned out or when maintenance is needed.  

Key features

  • High purification performance >90%
  • Easy to install with no modifications to vehicle or filter needed
  • Regenerates, cleans itself during regular vehicle operation
  • Long maintenance intervals
  • Approved in several European Low Emission Zones, for instance in Germany, the UK and Denmark

PROCAT™ diesel oxidation catalyst systems (DOC)

Proventia PROCAT™ systems are reliable, maintenance-free solutions for machines and vehicles that operate in the lower emission regulation environment.  PROCAT™ systems are based on diesel oxidation catalyst technology that reduces effectively hydrocarbon (HC) and carbon monoxide (CO) emissions as well as the soluble organic fraction of the particulate matter (PM) by up to 20 %.

The PROCAT™ product family also includes the PROCAT™ partial diesel particulate filter (pDPF) systems that can achieve a PM reduction (soluble organic fraction) of up to 40%. PROCAT™ DOC and pDPF systems are simple to install, safe and easy to use in various operating conditions and driving cultures, making them cost-effective solutions for on- and non-road retrofits if there are no high PM reduction targets or NOx reduction targets.

How does it work?


In PROCAT™ DOC systems, HC and CO, as well as PM emissions, are oxidised into carbon dioxide (CO2) and water (H2O) over a precious-metal-coated catalyst. The choice of catalyst formulation depends on the duty cycles and the temperature conditions of the application. PROCAT™ pDPF systems – also called Flow Through Filters – use special corrugated metal foil with the capacity to capture particulates. Particulate matter is then oxidised through reactions with nitrogen dioxide. pDPF systems offer a 20% – 40% reduction in PM.

Key Features

  • Maintenance-free system for lower emission regulated areas
  • Tolerant of different fuel qualities
  • Adaptable to various operating conditions and driving cultures
  • Long lifetime
  • Muffler integrated
  • Easy to install