Powervent Water Heater Has Cold Air coming into Vent
It's a bad &amp; incomplete install &amp; nothing at all to do with the equipment. Get that Contractor back to seal everything up, which is the law. You very likely could &amp; would get exhaust gases with that cold air.

There's absolutely no reason at all that you should feel even the slightest draft. It needs to be fully sealed inside &amp; especially outside. I'm sorry a "pro" left you with this shoddy work...they should've been upfront &amp; scheduled to comeback the next day to finish-up.

If they refuse, then call the Building Inspector to report them &amp; force them back out to do it right.