(1) A power-ventilated enclosure required by the Fire Code made under the Fire Protection and Prevention Act, 1997 shall be designed and constructed to conform to Articles 6.2.13.4. and 6.2.13.5.
(1) The ventilation system for a power-ventilated enclosure referred to in Article 6.2.13.3. shall,
(a) conform to NFPA 91, “Exhaust Systems for Air Conveying of Vapors, Gases, Mists and Noncombustible Particulate Solids”,
(b) provide continuous exhaust ventilation at an air velocity sufficient to prevent the accumulation of combustible or reactive deposits in the power-ventilated enclosure and its exhaust duct system,
(c) confine flammable vapours and particles to the area where they are generated and exhaust them to the outdoors,
(d) not return the exhausted air to the building, and
(e) be provided with well identified control switches that are,
(i) located outside the power-ventilated enclosure, and
(ii) readily accessible in case of an emergency. (2) Fire dampers are permitted to be used within the exhaust duct system of the ventilation system for a power-ventilated enclosure referred to in Article 6.2.13.3.
(1) The power-ventilated enclosure referred to in Article 6.2.13.3. and its exhaust duct system shall,
(a) except as provided in Sentences (2) and (3), be constructed of noncombustible materials compatible with and chemically resistant to the flammable vapours and particles being exhausted, and
(b) be provided with access doors to permit inspection and maintenance of the fan assembly and exhaust ducts. (2) Combustible materials are permitted in the power-ventilated enclosure described in Sentence (1) and its exhaust duct system if,
(a) such materials are required by the corrosive or reactive properties of the chemicals or liquids being used, and
(b) their flame-spread rating is not more than 25. (3) The flame-spread rating required in Sentence (2) is permitted to be greater than 25 if an automatic fire suppression system is provided inside the power-ventilated enclosure and its exhaust duct system.