In the event of damage, the
material or product shall be repaired and restored to meet
its intended listing or clearance requirements and shall
be approved by the Authority Having Jurisdiction.
[NFPA 96:4.2.4.1]
In the event of a fire within a kitchen
exhaust system, the duct and its enclosure (rated
shaft, factory-built grease duct enclosure, or field-applied
grease duct enclosure) shall be inspected by
qualified personnel to determine whether the duct
and protection method are structurally sound,
capable of maintaining their fire protection function,
and in accordance with this chapter for continued
operation. [NFPA 96:4.2.4.2]
Protection shall be
provided on the wall from the bottom of the hood to
the floor, or to the top of the noncombustible material
extending to the floor, to the same level as
required in Section 507.3. [NfPA 96:4.2.4.3]
The protection
methods for ducts to reduce clearance shall be
applied to the combustible or limited-combustible
construction, not to the duct itself. [NFPA 96:4.2.4.4]