I may have asked this before, but since searching on these boards is so onerous, I will ask it now.
I have an old metal box fan that I put up in the crawl space/attic of a garage apartment. I leave it up there all year 'round. When it comes to be summer, I plug it in and it seems to help draw hot air out of the attic through the vent window it is next to. In the winter I lie it down. In the summer I prop it up and it stays put.
My question is, is there any fire danger? I am home most of the time but can't monitor it all the time. I unplug it when I leave home or go to sleep.
Could the extremes of temperature affect something in the motor, lubricants?, that might make it more likely to freeze up/seize when it is being used in the summer, causing a fire.
Is it likely that whatever air it draws out could bring enough dust into the motor that that might cause a fire hazard? The attic is unfinished. I know there are the occasional bug up there, maybe a wasp's nest, but otherwise it is just fiberglass batting as far as I can tell.
I have the accessway to the fan closed off with a screen now but I will inspect it if anyone thinks it is worth it.
The fan is at least 20 years old and may be more than that. It's big and heavy. It would be protected from rain since it is far enough away from the vent.
Please let me know if there is anything else I need to consider.