AT-4 Tier 4 Active
SCR/DPF System
A compact solution capable of emissions reduction that meets or exceeds Tier 4 Final requirements for stationary diesel engines, combining a DOC, an active self-regenerating DPF and an XPress Preheat SCR in a single high-performance package.
Designed for standby and prime power diesel engines from 1 MW to 4 MW. Ideal solution for retrofit and new applications where engine reliability and environmental compliance are equally important.
MIRATECH® technology is available through ECI, a MIRATECH Company.
Get in touch →
Complete Emissions Control
in a Single System
When generator reliability and environmental compliance are equally important.
The MIRATECH AT-4 Tier 4 is an advanced active emissions control system engineered for continuous reliability in mission-critical environments. Unlike conventional after-treatment systems, it integrates multiple proven technologies into one modular package.
Delivering emissions reduction while maintaining reliable performance at idle, low-load and variable-load operation, making it ideal for facilities where uninterrupted power is essential.
- Tier 4 Final emissions performance meets or exceeds regulatory requirements
- Active DPF regeneration independent of engine load
- XPress Preheat SCR system drammatically reduces time to urea injection after engine startup
- Compact modular construction for new build and retrofit applications
- Retrofit-friendly design with minimal site impact
- Integrated silencing up to 25 dB(A) no separate silencer required
- Low system pressure loss to suit engine manufacturer requirements
Ideal solution for retrofit and new applications. The compact footprint allows installation within existing plant rooms or generator enclosures, both new projects and retrofits.
Reliable Performance at Any Load
Many diesel after-treatment systems rely on high exhaust temperatures to function effectively. The MIRATECH AT-4 Tier 4 has been engineered specifically for standby generators that often operate at low loads or idle where conventional systems fail to perform.
Its active regeneration technology enables the DPF to regenerate independently of engine load, while the integrated XPress SCR heating function allows the system to reach operating temperature in approximately ten minutes.
This means operators benefit from full emissions compliance from the moment their generator is needed, not after a lengthy warm-up that conventional systems require.
Operators benefit from:
- Reliable emissions control during low-load operation
- Automatic filter regeneration, no operator intervention required
- Reduced maintenance requirements over the system lifetime
- Consistent compliance across varying operating conditions
- Compact design suitable for new and retrofit installations
AT-4 at a glance
Comprehensive Pollutant Control
The AT-4 system effectively reduces all major pollutant types from diesel engines in a single integrated solution.
Engineered for Critical Environments
Active DPF Regeneration
The DPF regenerates independently of engine load, no minimum exhaust temperature required. Fully automatic, no operator intervention needed.
Fast SCR Warm-Up
Integrated SCR heating brings the system to operating temperature in approximately 10 minutes, rapid emissions control from the very first operation.
Integrated SCR + DOC + DPF
Three proven technologies in one compact, modular package, eliminating the complexity and footprint of separate system components.
25 dB(A) Integrated Silencing
Built-in acoustic attenuation up to 25 dB(A) no separate silencer needed in most applications. Additional options available for demanding sites.
Compact Modular Design
Compact footprint designed to fit within existing engine rooms and generator enclosures suitable for both new projects and retrofit applications.
Retrofit-Friendly
Engineered to integrate with existing 1–4 MW generator installations with minimal site impact and downtime during the installation process.
Low Pressure Loss
System pressure loss is designed to remain within engine manufacturer requirements, protecting generator performance and warranty obligations.
Reduced Maintenance
Active regeneration and integrated system design reduce the frequency and complexity of scheduled maintenance across the full asset lifetime.
Consistent Compliance
Designed to maintain Tier 4 Final compliance across the full range of generator operating conditions: idle, low-load and variable-load alike.
Reduces Emissions
and Noise.
The MIRATECH AT-4 Tier 4 doesn't just reduce emissions, it also reduces noise. Integrated acoustic attenuation delivers up to 25 dB(A) of sound reduction, eliminating the need for separate silencer systems in many applications. Additional attenuation options are available where site requirements demand lower noise levels.
reduction
Suited to Facilities Where Reliability
and Compliance are Equally Important
Space is often at a premium in plant rooms and containerised power systems. The AT-4's compact footprint and retrofit-friendly design make it an ideal solution for a wide range of critical sectors.
Healthcare
Facilities
Institutions
Resources
Manufacturing
Wastewater
Infrastructure
Also available through ECI: MIRA-CUBE™ compact plug-and-play SCR/DPF for 1–4 MW diesel generators, ideal for data centres and space-constrained sites.
Speak to Our Team
About Your Project
ECI's applications engineers will assess your generator, site constraints and EPA licence conditions and recommend the right emissions control solution for your facility.
Head Office: 29–33 Fonceca Street, Mordialloc VIC 3195 · 1800 730 158 · eci@exhaustcontrol.com.au · exhaustcontrol.com.au