What do you do with a direct vent exhaust?

I've got a used tankless that this guy wants me to install.

Code says to follow MFG guidelines but they don't give any save for separate vent/intake piping. There is nothing for direct vent.

Sorry when I say direct vent, i'm referring to the single pipe that delivers air to the unit and exhausts it as well through separate air spaces.

Suggestions?
Via RSSMix.com Mix ID 8247361 http://www.rssmix.com/

Comments