Ventilation ducts-T/ALL.

§ 32.56–60 Ventilation ducts—T/ALL. (a) Each duct for ventilation of Category A machinery spaces that passes through accommodation, service, or control spaces must be: (1) Constructed of steel and insulated to “A-60” Class; or (2) Constructed of steel, fitted with an automatic fire damper at each boundary where it enters and leaves the Category A machinery space, and insulated to “A-60” Class for a distance of 5 meters (16.4 feet) beyond each machinery space boundary. (b) Each duct for ventilation of accommodation, service, and control spaces that passes through Category A machinery spaces must be constructed of steel and be fitted with an automatic fire damper at each Category A machinery space boundary.