NATURAL GAS - SPARK IGNITION (SI)
Emission Control for
Natural Gas
Generators
Engineered aftertreatment systems for rich-burn and lean-burn stationary natural gas generators. EPA and CARB verified. Custom built to your engine, site, and permitting requirements
90-99%
NOₓ Reduction
EPA + CARB
Verified Systems
30+ Years
Stationary Power Experience
Custom
Engineered to Application
SOLUTION SELECTION
Which engine type do you have?
Natural gas generator aftertreatment is selected based on combustion type, not just fuel. The two engine classes require fundamentally different catalyst chemistries.
RICH-BURN ENGINE
Stoichiometric Combustion
Rich-burn engines operate near the stoichiometric air/fuel ratio. This creates exhaust conditions suited for 3-way catalyst chemistry that simultaneously reduces NOₓ, CO, and HC.
RECOMMENDED SOLUTION
NSCR/ 3-Way Catalyst System
CO ✓
NOₓ ✓
HC ✓
HAP's ✓
LEAN-BURN ENGINE
Excess Air Combustion
Lean-burn engines run with excess air, producing high oxygen exhaust. This requires urea-based SCR technology for targeted NOₓ reduction alongside CO and HC control.
RECOMMENDED SOLUTION
SCR System (BlueMAX™ 500/520 Series)
NOₓ ✓
CO ✓
HC ✓
Not sure which type you have? Check your engine dataplate or generator OEM documentation. Common rich-burn brands: Jenbacher(J-Series), Caterpillar G-Series. Common lean-burn: Caterpillar G3500/G3600, MTU, Cummins QSK. Our engineers can confirm based on your engine model.
NATURAL GAS PRODUCTS
Emission Control Systems
All systems are custom engineered to your engine specifications, site constraints, and permitting requirements. No off-the-shelf sizing.
NSCR System
3-way catalyst for rich-burn natural gas generators. Simultaneous NOₓ, CO, and HC reduction with integrated acoustic attenuation in one compact unit.
NOₓ up to 99%
CO up to 90%
HC up to 80%
BlueMAX™ 500-Series
Integrated SCR-silencer system for lean-burn natural gas generators. High-efficiency NOₓ reduction with DEF dosing and acoustic attenuation in one compact system.
NOₓ high-efficiency
CO ✓
HC ✓
BlueMAX™ 520-Series
Compact inline SCR-silencer configuration optimized for space-constrained generator room installations. Same emissions performance, smaller footprint.
NOₓ high-efficiency
CO ✓
HC ✓
Oxidation Catalyst Systems
Standalone oxidation catalyst for CO and HC reduction. Used as a primary control device or upstream conditioning stage in multi-component aftertreatment systems.
CO ✓
HC ✓
HAP's ✓
Generator Silencer System
Critical, super-critical, and hospital-grade silencers in disc, cylindrical, and rectangular configurations. Sized to your engine exhaust flow and site noise requirements.
Critical Grade
Super Critical
Hospital+
ENGINEERING CONSIDERATIONS
What your system must account for
Regulatory & Permitting
EPA compliance, CARB requirements, and local air quality district rules. These are all addressed in system design and documentation included with every unit.
Space, Weight & Access
Aftertreatment equipment requires structural support, maintenance clearance, and site-specific integration. Engineered layouts are provided for every installation.
Backpressure Management
Every system is designed to stay within OEM engine backpressure limits. CFD-modelled exhaust flow ensures catalyst and silencer performance without engine impact.
DEF Dosing & Heating
Airless DEF injection eliminates crystallization risk. Heated lines(24VDC, active below -6°C) and dual heating strategies ensure reliable dosing in all climates.
Controls & Monitoring
HMI display, real-time NOₓ monitoring, alarm outputs, datalogging, MODBUS, and BMS integration available for mission-critical installations.
Air/Fuel Ratio Control
NSCR systems require stable stoichiometric operation. Nett offers integration A/F ratio controllers (BlueCAT™ 100/300) to maintain catalyst performance.
Verified & Certified Systems
U.S. EPA
Verified Emission Control Strategy
Verified Emission Control Strategy. Cite directly in permit applications
CARB
Level 3+ Verified
California Air Resources Board. The most stringent standard in North America
ISO 9001:2015
Quality Management Certified
Controlled quality processes across engineering, manufacturing, and delivery
CWB / CSA W47.1
Certified Steel Fabrication
Canadian Welding Bureau certified. Structural quality for industrial applications.
Ready to Spec Your System?
Every installation is custom. Tell us your engine, site, and compliance requirements. Our engineers will scope the right solution.
- Free Application Review
- EPA / CARB Docs Included
- Custom Installation Manuals
- BMS / MODBUS Integration