A friend just inherited an old farm house in the country. He said it is pretty run down and does not intend to fix it up. He wants to use it for some indoor firearms training. His thoughts are to use it especially in the winter when it is cold out and of course to similate some real life training excercises. The nearest neighbor is probably 100 yards away and not within sight of the house (trees and hills between) He made some bullet traps from some thick steel and is reinforcing the backstop where the targets are in the house with sandbags, etc. Here is my question to those that may have some knowledge in this. Wont he have to have some kind of ventilation system? He said he plans on shooting FMJ ammo, not lead.