That fan looks like the one in my camper. I tried cleaning mine and couldn't get the screen off either. The fan was scraping on the screen and when I had it in for servicing, the lads at Customer RV fixed it, from the top side. I'd reach out to them and ask how to get the screen off. I'm sure they'll help you out.
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2013 2619
80 watt solar panel/swing hitch/low profile A/C.
Enduro 4445 caravan mover
2016 Dodge Ram 1500 V8 Hemi
Installed powered folding tow mirrors
Stopped playing with airplanes, now I just enjoy watching them fly by.
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