Is it possible to install fire dampers on #firewalls? And if it is 4 hours rated firewall?
Can you provide any #NFPA 1 and #NFPA 221 reference for this?
Also, which approvals are required for this equipment?
To determine when the protection of ducts and air transfer openings in fire walls are required, they are governed by the building codes not within the scope of NFPA 1 or NFPA 221.
Excerpt from 2018 NFPA 5000, Building Construction and Safety Code.
Since Fire Walls create separate buildings, with or without a lot line, duct penetrations are unusual and only possible under certain conditions:
706.11 Ducts and air transfer openings. Ducts and air transferopenings shall not penetrate fire walls.Exception: Penetrations by ducts and air transfer openingsof fire walls that are not on a lot line shall be allowed providedthe penetrations comply with Section 716. The sizeand aggregate width of all openings shall not exceed the limitationsof Section 706.8.
Also, Fire dampers come in 1-1/2 and 3 hour ratings. Most Fire walls are 2 or 3 hours, see chart:
I hope this is helpful.
Great comment - fair enough.
I would like to add to your comment. Most the projects I have reviewed for building and life safety code requirements had firewalls used for compliance to the building and area requirements of Chapter 5 of the IBC. . The separation was for the construction type of the building only not to separate building for separate ownership. On existing buildings, compliance to Chapter 5 was required for change of occupancy or additions to the building. The air ducts and transfers were commonly passing through for firewall construction that I have reviewed.
Retrieving data ...