If you have windows it is 2 m between house and wall, the roof must not overhang into another property, if no windows, and you build to the wall, rain water must be kept on your own side of the wall, ie. internal gutter, which I have at the rear of the house kitchen extension.
One of my jobs is to wipe the fan blades every few months, as well as doing similar to the standing ones in the kitchen, oh, and I mow the lawn too, if it needs it......
Bedroom A/C also gets a clean every few months for the same reason, but I pay a bloke to do that with his pressure washer equipment....
Your chum needs a word in his ear.....????
It does get hot upstairs, so put the A/C on for a while to cool things down then let the fan take over for the rest of the night. For me it is far healthier too. Downstairs is a large open plan area, except for the kitchen, doesn't need A/C, has 4 ceiling fans which can be used depending on where you are situated, 2 are on all day. ????
PS. When we get a power cut, the fans are missed...
I bought 9 ceiling fans that are now 15 years old, only replaced one and fitted new capacitors in a couple that are on all day, every day....
They really are a must in any build, especially the bedroom, running all night...????
There is a semi-wad-cutter for 9mm, but I doubt that range would have them, but ya never know.
Many years ago I did shoot at a Thai military base range at Sattahip, using a revolver, all the ammo was wad-cutter for revolvers.