I can't make-up this stuff!

Oh my so the gas goes out and then comes right back in.  I am going to look at this out side now.

Jim,

That is a very revealing video that should make homeowners think seriously about the different ventilation systems in their homes.  At the least they should cap the chimneys.  

This is why you have building codes, the exhaust vent needs to be a certain distance from all home openings. Really some contractors should be run out of town but as long as homeowners go for the cheapest price this is what happens.

That could really be a bad thing.  I bet you see all sorts of things that make your hair stand up on end.

Great post and video and most of all thank you for sharing it with us.

Great video!  Yes, there are distance requirements, no, not all builders follow them.  I love home inspectors!

Wow Jim - that is scary!  Glad that you are there to catch that for potential home buyers!  

Good morning Jim. I have never seen anything like this. Very very scary. Have you seen it before? What wouls cause this? OMG. Great catch.

Jim, this is  a really great video---and great example for the importance of EVERY combustion appliance having its own source of combustion/dilution air from the outside.  Sooner or later this will make its way into the codes.  What is particularly interesting is that this gas appliance DOES have its own source of air and there is some other reason the house is under negative pressure---so something other than the furnace is at fault----perhaps some other gas appliance or even the dryer, range hood or any combination of other exhaust fans.  Very interesting.

No question that is a revealing video, thanks for sharing!

Thanks for sharing. I appreciate the information!!