Co ppm limit for combustion tes

Hvac tech_2

What is the max co ppm limit up the flue and we're is it documented. I always go for 0 to 150 ppm in both residential and commercial but looking for a documented code limit.

Ironman

400 ppm as per the EPA, but I wouldn't want to go that high. There's also ambient maximum levels/hours exposure. You'll have to google it, but it is on their site.

Tim McElwain

The ANSI Standard is 400 PPM allowable in a flue sample. We however strive to get 100 PPM or less. A lot of new Mod/Cons give a number they want for their equipment. Contact me at gastc@cox.net and I will share some information with you.