[Closed] Random Heating question - looking for quiet wall mounted fan heaters!

Wondered if anyone is a heating engineer or the like and could advise if it is possible to get quiet wall mounted fan heaters. Needing to heat a small village hall which currently has 'over-door' heaters fitted which are efficient but noisy.

I found a ceramic fan heater that is quiet, but too complex for the set up, so wonder if anyone knows of anything commercial that might fit the bill. There are four fitted and they need to be able to be switched from one main switch.

Heaters need to be on the wall for safety - children running about, playing ball games etc.
Any other options?? Thanks!