An
abandoned pipe or conduit from a previous installation
shall be removed from within the hood, plenum, and
exhaust duct. [NFPA 96:10.2.7.1]
Penetrations and holes resulting
from the removal of conduit or piping shall be sealed
with listed or equivalent liquid-tight sealing devices.
[NFPA 96:10.2.7.2]
The addition of obstructions
to spray patterns from the cooking appliance nozzle(s)
such as baffle plates, shelves, or a modification shall
not be permitted. [NFPA 96:10.2.7.3]
Changes or modifications
to the hazard after installation of the fire-extinguishing
systems shall result in re-evaluation
of the system design by a properly trained, qualified,
and certified person(s). [NFPA 96:10.2.7.4]