Go Back   InterNACHI Inspection Forum > Specific Inspection Topics > Inspecting HVAC Systems

Notices

Inspecting HVAC Systems Topics include heating, venting, and air conditioning inspections.

Reply
 
LinkBack Thread Tools
  #1  
Old 2/4/12, 6:15 PM
Hubert A. Miles Hubert A. Miles is offline
InterNACHI Member
 
Join Date: Jun 2008
Location: Johnsonville, SC
Posts: 82
Default Gas Furnace/Water Heater Venting

I have a question about how I should write this up. We don't find a lot of gas furnaces and water heaters in the south. I ran across a gas furnace in a crawl space today. The vent pipe fed into a masonry chimney. In the garage a gas water vent also vented into the side of the chimney above the furnace vent. I believe the two are tied together but can't confirm because it is behind the masonry. Out of the top of the chimney is a single metal flue.

Any thoughts?
Attached Thumbnails
gas-furnace-water-heater-venting-img_0175.jpg   gas-furnace-water-heater-venting-img_0178.jpg   gas-furnace-water-heater-venting-img_0218.jpg   gas-furnace-water-heater-venting-img_0231.jpg  



Hubert Miles - Myrtle Beach Home Inspector

Patriot Home Inspections - Infrared Certified Home Inspector serving the Pee Dee and Grand Strand areas of South Carolina.
Reply With Quote
Need a home inspection in Tennessee? Check out InterNACHI's listing of Tennessee certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #2  
Old 2/4/12, 6:32 PM
Joseph Hagarty,  CMI's Avatar
Joseph Hagarty, CMI Joseph Hagarty,  CMI is offline
InterNACHI Member
 
Join Date: Jan 2003
Location: West Chester, PA
Posts: 6,879
Default Re: Gas Furnace/Water Heater Venting

General Notes:
- All Chimneys and Flues should be inspected and swept on an annual basis with use.
- It is recommended that a Level 2 Inspection of the chimney / flue be conducted at
this time (prior to closing) in accordance with the NFPA standard.  



Joseph P. Hagarty
joseph.hagarty@comcast.net
Main Line Inspections, Inc.
Phone: 610-399-3675
Email: MainLineHI@comcast.net

http://pa.nachi.org/mainlinepa/about.html
http://www.householdinspector.com

National President / NACHI (2003-2004)
NACHI Education Committee Member
PA NACHI Certified Inspector # 01102902
Delaware Licensed Home Inspector # H4-071
Reply With Quote
  #3  
Old 2/4/12, 9:23 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
InterNACHI Member
 
Join Date: Apr 2004
Posts: 7,188
Default Re: Gas Furnace/Water Heater Venting

I occasionally see double wall class B running the full length of a non-lined masonry chimney which is allowed in this State
Reply With Quote
  #4  
Old 2/4/12, 9:39 PM
Bob Elliott's Avatar
Bob Elliott Bob Elliott is offline
InterNACHI Member
 
Join Date: Aug 2006
Location: Chicago
Posts: 30,877
Default Re: Gas Furnace/Water Heater Venting

I would call out the flex going through the knockout and recommend a better support strap for tht B vent as they are using wire.
Reply With Quote
  #5  
Old 2/4/12, 9:47 PM
Christopher Currins's Avatar
Christopher Currins Christopher Currins is offline
InterNACHI Member
 
Join Date: Feb 2007
Location: Godfrey, IL
Posts: 11,640
Default Re: Gas Furnace/Water Heater Venting

Is the vent pipe running downhill?





CBC HOME INSPECTIONS

Christopher Currins
Professional Home Inspector In Edwardsville, Glen Carbon, Godfrey, Maryville,
Fairview Heights, O'Fallon and surrounding areas of S
outhern Illinois

We Make It Safer
Reply With Quote
  #6  
Old 2/4/12, 9:56 PM
Robert Ernst Robert Ernst is offline
InterNACHI Member
 
Join Date: Sep 2010
Location: Reno,NV
Posts: 859
Default Re: Gas Furnace/Water Heater Venting

If it's vented into the chimney it's not allowed and the appliances should be checked for spillage. If the pipe is using the chimney as a chase that's fine but there is often sheetmetal to close off the top of chimney and prevent debris and moisture from getting in.



Nevada Inspector of Structures #1730
Nevada Energy Auditor #30
www.homecsi.com
Reply With Quote
  #7  
Old 2/5/12, 1:08 AM
Cameron Anderson's Avatar
Cameron Anderson Cameron Anderson is online now
InterNACHI Member
 
Join Date: Nov 2011
Location: Peoria, IL
Posts: 6,424
Default Re: Gas Furnace/Water Heater Venting

As far as the flue is concerned you can't report on what you can't see. There is either a wye-connector and a metal flue running the length or there is not, but you can't confirm it either way.

I think the most you could say is, (assuming this is true) "Cannot confirm proper venting of combined furnace and water heater. This is not a common installation in this area of the country and I recommend further evaluation to verify proper venting of gas burning appliances through the chimney."

And you could also say nothing, or "Chimney flue not fully visible."



Cameron Anderson
Bachelor of Architecture, U of I, Urbana IL
Illinois Licensed Inspector
www.aaintegrityhomeinspection.com
Reply With Quote
  #8  
Old 2/5/12, 9:19 AM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
InterNACHI Member
 
Join Date: Apr 2004
Posts: 7,188
Default Re: Gas Furnace/Water Heater Venting

Quote:
Originally Posted by canderson5 View Post
As far as the flue is concerned you can't report on what you can't see. There is either a wye-connector and a metal flue running the length or there is not, but you can't confirm it either way.

I think the most you could say is, (assuming this is true) "Cannot confirm proper venting of combined furnace and water heater. This is not a common installation in this area of the country and I recommend further evaluation to verify proper venting of gas burning appliances through the chimney."

And you could also say nothing, or "Chimney flue not fully visible."
If one owns a CO meter ya can confirm from the roof proper venting
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shared Venting gas boiler and water heater ljansson Inspecting HVAC Systems 1 5/11/10 5:03 PM
Furnace/water heater venting Dave Huss AskNACHI.org Inspection Questions Forum 3 12/17/09 5:03 PM
Water Heater / dryer venting kweiss Plumbing Inspections 5 11/10/09 10:02 PM
Venting an oil-fired water heater mh718 Inspecting HVAC Systems 3 11/16/06 9:36 AM

All times are GMT -4. The time now is 12:35 PM.
no new posts