Jump to content

asbestos insulated vent?


kimball gray
 Share

Recommended Posts

1950's house. Hot water tank has a b-vent attached to the exhaust hood on the tank. the b-vent goes up into the attic. Once in the attic, I see this pipe vent that looks like asbestos. What is it? There is another one on the gas heater vent in the attic space.

Click to Enlarge
tn_201072217519_100_0684.jpg

45.64 KB

It is a transite flue pipe, aka cement asbestos pipe.

http://www.inspectapedia.com/sickhouse/ ... slookF.htm

Link to comment
Share on other sites

We've discussed this before, Kimball. I think there were a couple of dissenting opinions, but you should know that most of us don't think Transite flue-pipes pose safety issues when they're located in attics and therefore we don't recommend replacement.

Link to comment
Share on other sites

I'd recommend it be replaced because it's too big for a water heater and Transite and gas ( I'm assuming it's not an oil fired water heater) fired appliances don't play well together. The gas fired exhaust gets cooled with dilution air and is well on its way to to a condensing temperature prior to entering the Transite flue. The Transite flue heats slowly and and the resulting acidic condensate erodes its interior.

Finally, I've never seen a gas appliance (excluding condensing units)that specified any material other than metal for a flue.

Link to comment
Share on other sites

I'd recommend it be replaced because it's too big for a water heater and Transite and gas ( I'm assuming it's not an oil fired water heater) fired appliances don't play well together. The gas fired exhaust gets cooled with dilution air and is well on its way to to a condensing temperature prior to entering the Transite flue. The Transite flue heats slowly and and the resulting acidic condensate erodes its interior.

Finally, I've never seen a gas appliance (excluding condensing units)that specified any material other than metal for a flue.

That last sentence . . . even if Transite would function properly, would a manufacturer really put in its instructions, "connection to an approved metal or Transite asbestos-containing flue pipe?" : )

Link to comment
Share on other sites

  • 2 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...