I have some hardware cloth and have been putting it behind the air inlets on the sides and at the top of the generator enclosure. In doing some looking under the cabinet, I see a hole under each battery and then what appears to be a large square opening in the middle of the cabinet. Can that large opening be closed off with a piece of sheet metal? My guess is that it is there for a drain if a fuel line cuts loose or something but wanted to check. I was thinking of taking a piece of sheet metal and drilling a few small holes in it and using that instead of hardware cloth on the bottom.