I can't make-up this stuff!

Home Inspector with Perfection Inspection, Inc.

Make-up air:  The volume of air that is required to replace exhausted air from a given space.

If you have gas appliances,  a well weatherized and insulated home, and exhaust fans check out the following video for a serious consideration…

Comments (11)

Chuck Carstensen
RE/MAX Results - Elk River, MN
Minnesota/Wisconsin Real Estate Expert

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

Nov 17, 2011 01:01 AM
Paul Campbell Realtor Lexington
Rector Hayden, Lexington, Ky - Lexington, KY
Kentucky Homes for Sale


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.  

Nov 17, 2011 01:03 AM
David Popoff
DMK Real Estate - Darien, CT
Realtor®,SRS, Green ~ Fairfield County, Ct

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.

Nov 17, 2011 01:07 AM
Jim Allhiser
Perfection Inspection, Inc. - Salem, OR
Salem, Oregon Home Inspector

Chuck: Not a bad idea

Paul: I have never seen this phenomenon displayed so compellingly.  I had to spend about 20 extra minutes on the roof to wait for the breeze to switch back so that I could capture the video!

Nov 17, 2011 01:09 AM
Dr. Paula McDonald
Beam & Branch Realty - Granbury, TX
Granbury, TX 936-203-0279

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

Nov 17, 2011 01:10 AM
Joe Petrowsky
Mortgage Consultant, Right Trac Financial Group, Inc. NMLS # 2709 - Manchester, CT
Your Mortgage Consultant for Life

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

Nov 17, 2011 01:24 AM
Jenifer Lower
Bozeman Montana Real Estate .net - Bozeman, MT
Your Dream. Our Passion.

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

Nov 17, 2011 01:40 AM
Margaret Oscilia
Creative Concepts-Home Staging and Contracting, Salem Oregon - Salem, OR
Home Stager, Salem Oregon

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


Nov 17, 2011 01:49 AM
Sheila Anderson
Referral Group Incorporated - East Brunswick, NJ
The Real Estate Whisperer Who Listens 732-715-1133

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.

Nov 17, 2011 02:08 AM
Charles Buell
Charles Buell Inspections Inc. - Seattle, WA
Seattle Home Inspector

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.


Nov 17, 2011 02:46 AM
Fred Sweezer Sr. CMI, LLC.
Hud Certified 203K Consultant - Long Beach, CA
Certified Home Inspector

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

Nov 12, 2017 09:47 PM