"Chris Lewis" wrote in message
...
According to HeatMan :

I've worked on commercial laundry equipment. I've never seen any that
vent
separately...

How do they ensure that the drying air doesn't backdraft the combustion
air?

Fact is, there's no proof is doesn't backdraft through the non-working
equipment. Air follows the path of least resistance, like the breeze
through Nicks skull. commercial places I used to work at kept the doors
open nearly year around...

--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.