How do I fill the gap between fire damper and wall opening? 3

[hollandhvac]

My contractor wants suggestions what to put in the gap between the fire damper and the opening in the wall for a 2 hour fire rated wall. I only told him so far that it must ne something that will keep the 2 hours fire rating. But what the construction or material will be I have no idea, here is where I need suggestions

 

[MintJulep]

Intumescent firestop putty.

Available from multiple sources.

 

[DRWeig]

Look at 3M web site (link below), they have a whole catalog of UL-listed firestop systems -- one of which will be the simple putty that MintJulep suggested. There will be a simple drawing there that you can submit to your contractor.

http://solutions.3m.com/wps/portal/3M/en_US/fire/stop/resources/one/

Good on ya,

Goober Dave

 

[mauricestoker]

I would have guessed asbestos.

 

[DRWeig]

Maurice, wasn't that just the most useful stuff man ever dug up out of the ground? Tough, fireproof...

I miss it.

Goober Dave

 

[ChasBean1]

Intumescent sealant (aka fire sealant/caulk) should NOT be used. It is designed to expand under a fire condition and could deform the damper frame and render the damper inoperable. This is a pretty good link that talks about it:

http://www.smacna.org/technical/download.cfm?download_file=ACF4FA3.pdf

 

[MintJulep]

Good stuff Chas.

Read the instructions. Who'd a thunk...

 

[Artisi]

" DRWeig (Electrical) 10 Aug 10 16:15
Maurice, wasn't that just the most useful stuff man ever dug up out of the ground? Tough, fireproof...I miss it.Goober Dave"

Yes, very useful if you consider death from Mesothelioma as being useful.


"Mesothelioma, more precisely malignant mesothelioma, is a rare form of cancer that develops from the protective lining that covers many of the body's internal organs, the mesothelium. It is usually caused by exposure to asbestos.[1]

Its most common site is the pleura (outer lining of the lungs and internal chest wall), but it may also occur in the peritoneum (the lining of the abdominal cavity), the heart,[2] the pericardium (a sac that surrounds the heart) or tunica vaginalis.

Most people who develop mesothelioma have worked on jobs where they inhaled asbestos particles, or they have been exposed to asbestos dust and fiber in other ways. It has also been suggested that washing the clothes of a family member who worked with asbestos can put a person at risk for developing mesothelioma.[3] Unlike lung cancer, there is no association between mesothelioma and smoking, but smoking greatly increases the risk of other asbestos-induced cancers.[4] Compensation via asbestos funds or lawsuits is an important issue in mesothelioma (see asbestos and the law)." - Wikipedia

 

[DRWeig]

Artisi and all, I hope my comment about asbestos didn't offend anyone who suffers from its ill effects or has a loved one who suffers.

My intent was to lament the loss of a substance with such amazing properties. I was wishing there were a substitute that did not cause health problems...

Dave

PS -- ChasBean, good call again. A system tested with the particular damper is important, I didn't think of it either.