Dynamic fire damper listing

[cme]

I have been specifying Ruskin DIBD-2 fire dampers since I started my career

It has been brought to my attention that those dampers are not UL listed in horizontal installations for sizes larger than 24x24

http://database.ul.com/cgi-bin/XYV/...n=versionless&parent_id=1073986213&sequence=1

Apparently this is the same for Prefco, Nailer, etc

What have you been specifying?

 

[walkes]

I have been specifying NCA Fire Dampers.

http://www.ncamfg.com/Catalog-PDFs/FDD-A.pdf

 

[cme]

same issue with nca ....

http://database.ul.com/cgi-bin/XYV/...n=versionless&parent_id=1073986213&sequence=1

It appears that only the 3V multi-blade dampers are UL listed ...... same as Ruskin

 

[walkes]

Use the multiple damper installation for larger openings. The openings can go up to 72x96.

 

[cme]

Are multiple dampers UL listed?

 

[walkes]

The UL listing includes for installation of single or multiple dampers. The dampers would be interconnected such that a single fusible link activates them all.

 

[cme]

the maximum size for a dynamically rated curtain type fire damper is 48x36 in the horizontal position ..... this is the maximum size UL will test for that application

else you have to go to a static rated curtain damper or a fire/smoke damper

one has to look at the free area and static pressure drop due to elbows, etc

i will post again when i get all the info