fresh air system

I have always been overly sensitive to isocyanides. A good respirator is not enough, no booth, and I am just a hobby guy that has done more than a few over the last 30 years. I have several cars to do, and I will just have to get a fresh air system. I started looking on the net yesterday, and I did see some complete for a round $450. turbine compressor, hood, hose ( needs more than 25 ft!).... That I can afford, but I was afraid I would have to spend twice that.
Anyone with opinions, input, experience ?
That's a tuff one for me I am not sensitive to isocanides but maybe check into an oiless compresser or a fan and bring air from out side to your mask. Been in a paint booth most of my time and never thought about it.