1. Selective Catalytic Reduction (SCR)
Technology
with Diesel Exhaust Fluid

2. What is SCR?
 Selective Catalytic Reduction (SCR) is a technology which leading
North American manufacturers of diesel vehicles have jointly
adopted after comparing and testing a variety of available
technologies aimed at reducing emission levels to the required
limits.
 SCR is the only technology that produces the reduction of exhaust
fume emissions required by legislation while allowing optimum
engine operation in terms of performance and fuel consumption.
 SCR technology is proven to enable Heavy Diesel Vehicle engines
to comply with the Clean Air Act which took effect in 2010. Air1® is
the most efficient way to take full advantage of SCR technology and
to meet EPA emission regulations.

3. SCR works with the addition of DEF, a high
purity urea based fluid
SCR technology reduces emissions of the NOx gases that are produced
inside the engine during combustion. It works with DEF (or AdBlue in
Europe) that is injected in the hot exhaust gas stream just prior to the
SCR unit.
The DEF is hydrolyzed to ammonia (NH3) and inside the SCR unit it
assists in breakdown of NOx to harmless Nitrogen gas (N2) and
water (H20).

4. Why will SCR with DEF make you save on fuel?
 Competing technology EGR combats NOx inside the
engine by re-circulating a portion of the exhaust
back through the engine’s cylinders. This requires
the engine to work harder and consume more fuel.
 SCR process allows engines to operate at maximum
efficiency, increasing fuel economy, and lowering
costs.
 OEMs and fleets utilizing SCR have seen fuel
efficiencies ranging from 4 to 11% percent in trucks
equipped with SCR technology.

5. For further information please
contact the Air1® team
at: 877-810-4 DEF (333)
www.air1def.com