That was what I figured the fan was for. I run a fan when under the house as well. Lots of debris under ours too as well as piles of sand from the original excavation for the foundation walls. A number of pieces of the 1" t&g fir sub flooring down there. All the pieces on the ground were like brand new after 55 years. Very little moisture as it drains away fast due to the sand.
My crawlspace hole is on the back of the house. Concrete foundation with a brick house on top. Concrete is about 2' from ground to brick and about that width. Not a clue what to do that will look good. Has never had a real door that I can tell. So far my only thought is to furr the inside with treated 2x4 and make an insulated and sealed hatch that screwed to it. Rarely ever need access there.
Probably a sandwich panel for the hatch as well.
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