I look at adding vent as an enhancement, not a requirement.
My generator stopped due to overheat once when I backed over tall swale. No big issue, we were learning. Out of curiosity, I looked at mark we leave on grass when generator running. Then did a test with door open much less of a mark in same run time.
What we have works fine, adding a vent appears to improve cooling when unit idle.
Seeing same model (24.1) now produced with vent tells me factory engineers came to same conclusion.
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