1) In the duct that passes through the compartment, fire damper is installed and is blocked automatically when there is a fire.
▶ In the duct which passes through the compartment, fire damper etc. which can prevent the fire spreading should be installed.
2) Is Cable Tray which passes through the compartment wall either treated with fire retardant or countermeasure to prevent fire expansion below Tray?
▶ There should be a countermeasure to prevent expansion of fire flicks etc. under the cable tray when it is on fire.