Need respirator recommendations

After reading the responses, and doing some research, it looks like the only safe way to spray urethanes is to use a fresh air respirator. Does anyone have any suggestions? It looks like they are kind of pricey, but I’d consider it if that’s the way to go. The other option would be to avoid urethane paints and just stick with epoxy. Some years ago I belonged to an EAA chapter that bought an HVLP turbine system that had a fresh-air system built in. Several chapter members used it to paint their airplanes with urethane paint. I really wanted to stick with my regular compressor and HVLP gun if possible.
Filtering compressed air freaks me out but they say it works. You still need it for epoxy. Really need to monitor the carbon monoxide. That turbine is the ticket. They use filters and fresh air for sandblasting too. Some of those products seem cheaper.

Lots of people been running filters for years with no problems. I have a good friend been doing this for 50 years. He's 75 and smokes. He'd still be hard at it if he hadn't wrecked his Harley hard. Messed up his shoulders.