Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
I have been spending quite a bit of time in medium sized commercial boiler rooms lately. I have been noticing that the majority of the air vents are closed (isolated with a ball valve). I may be peaking into Pandora's box here but, is there a reason for this?
I have always left the vent open figuring if air is in it wants to get out. Why not let it?
My question is, was the vent leaking and someone just closed it rather that fix it or is there a logical reason for closing them?
"If you can't explain it simply, you don't understand it well enough"