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We have 45 2.5MW generators and about half of them have filters which drain back into the crankcase and route the vapors into the intake like here in the pic. The other half vent behind the radiator to the atmosphere without going thru a filter.
I didn't stay at a Holiday Inn Express last night but was wondering if anyone has ever tried this method. Maybe drain it back into the hole where you check to see if you have PMR's or forged rods.