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27% of greenhouse gas emissions come from transportation vehicles, negatively affecting the health of local communities and contributing to climate change. Rypos’ Ultra Low Emissions Diesel Particulate Filter for Transport Refrigeration Units (ULETRU DPF) offers an immediate and measurable solution that combats climate change on roadways by reducing black carbon and other short-lived climate pollutants by up to 95%.

This cost-effective solution protects the environment and the health of local communities and helps older diesel engines achieve regulatory compliance and extend their useful life.


DPF filter kits for Thermo King and Carrier diesel TRUs

From a cost savings of up to 60% compared to engine re-power to active regeneration without need for intervention from the driver, Rypos’ ULETRU DPF is the best choice for TRU fleets. These portable units meet or exceed all federal standards, are California Air Resources Board (CARB) Level 3+ verified, and meet CARB final Tier 4 emissions requirements.

Key Rypos ULETRU DPF stats

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metric tons of PM removed

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metric tons of CO2e removed

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metric tons of PM removed annually

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metric tons of CO2e removed annually


Rypos is the only ULETRU DPF manufacturer for transport refrigeration units. The Rypos ULETRU DPF is a highly effective self-cleaning diesel exhaust filter that uses an electrically conductive sintered metal fiber medium and electrical power from the TRU to regenerate the filter when needed.

Key features

  • Reduces PM up to 95%, hydrocarbons up to 77%, CO up to 94%, NO2 up to 96%
  • Compatible with both Thermo King® and Carrier® refrigeration units
  • No driver/operator intervention required
  • Proven technology
  • In stock and ready to ship



“Rypos is the best one out there as far as I’m concerned for the reasons mentioned: quality and customer service.”

Chris Shehan

TRU Dealer Owner

“Customer service is fantastic. I can’t complain. Whatever I need, they are good with. No beef.”

Carlos Medellin

TRU Dealer Service Manager, Arctic Leasing

“They have always taken my feedback very well and acted upon it. I’ve never been treated poorly... Very professional.”

Timothy Anderson

Director of Refrigeration, PLM Fleet

Benefits and


Active regeneration

Self-cleaning, independent of exhaust temperature

Maximum efficiency

Operates online without need for engine shutdown, with ≤ 1% fuel penalty

CARB 3+ verified & Tier IV EPA compliant ULETRU

The only DPF manufacturer capable of shipping a complete CARB 3+ compliant solution directly from the factory

Convenient portability

May be moved from unit to unit within fleet, allowing flexibility for retiring or selling older units

Diesel oxidation catalyst

Includes converter to help reduce Carbon Monoxide (CO), Hydrocarbons (HC) and Particulate Matter (PM) emissions

Ease of installation

Installs in approximately 4 hours

Robust design

Rugged, stainless-steel housing for all operating conditions

Warranty and service

Backed by a 4-year warranty and nationwide distributor network




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TRU dealer locator

Looking for a local dealer to answer your questions or help you get started?

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Want to learn more about Rypos’ ULETRU DPF?

View ULETRU DPF brochure

Operation & maintenance manuals

Find operation and maintenance manuals for Rypos ULETRU DPF.

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Fleetco Emissions Profile Sample

Rypos can provide a FREE emissions profile for your reefer fleet.

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Find out how Rypos ULETRU DPF can reduce the emissions from your reefer trailers by up to 95% to ensure regulatory compliance and extend the usable life of your diesel engines.