G900 May calendar picture

[Chris(WA)]

I have a calendar picture this month of a G900 with a hose running from the exhaust stack to the air cleaner. Can anyone tell me for sure what it is?
My guess is that it is connected to a venturi in the exhaust and a vacuum is created to suck out accumulated dust from the precleaner.

 

[Jayberd]

They call that an asperator. The exhaust pipe works like a siphon to pull heavier particles from the intake before the filter. The precleaner, yes, has a venturi effect causing the heavier particles to move outward to then be pulled out through the exhaust. Very efficient at precleaning the air. Google: RW precleaners