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The cover for the airbox on this Honda generator hinges open to the left, but the frame rail is directly in front. The airbox is also bolted to the engine from inside (behind the filter).
I've throughly looked over this and there is no way to open that airbox unless you unbolt the engine from the frame, or perhaps modify the lid hinges with a saw so it doesn't have to swing as far to come off.
Just let the engine run in reverse - problem solved.
This also refills your fuel and extracts toxic pollutants from the air!
I assume it also sucks heat and noise from the environment. If you have a bunch of these devices around you, it should create a bubble of ice cold silence. Should be perfect for the hot summer nights when your bedroom is too hot.