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fire dampers

Question asked by john.bosyj on Mar 17, 2018
Latest reply on Mar 20, 2018 by john.bosyj

Aside from other requirements, the Ontario Building Code waives the requirement for fire dampers if the duct serves air-conditioning or combined air-conditioning and heating units. Does anyone know why fire dampers are NOT waived if the duct serves heating only units?

Does NFPA have a similar relief for this situation? Fire Dampers Waived


(1) Fire dampersneed not be provided in noncombustible branch ducts that have a melting point above 760°C and that penetrate a required fire separation provided the ducts,


(a) serve only air-conditioningunits or combined air-conditioning and heating units discharging air not more than 1 200 mm above the floor and have a cross-sectional area not more than 130 cm2.