NFPA 90A is a fire protection
standard which deals primarily with
Installation of Air Conditioning and
Ventilation Systems.This standard
recognizes that an air duct system
has the potential to convey smoke,
hot gases and flame from area to
area and to supply air to aid
combustion in the fire area. Also,
an air duct system’s integrity may
also enable it to be used as part of
a building’s fire protection system.
The primary section of this
standard for thermal insulation is
Supplementary Material for Air
Distribution Systems.