Zone 1 Exhaust PortThe Zone 1 enclosure will exhaust hazardous fumes through the fan and port on the top of the enclosure. The 4.5” OD exhaust port must be connected to a facility exhaust ducted outside of the building. The facility exhaust line must be capable of exhausting 900 cfm of hot, damp air with hazardous and volatile fumes.If the Exhaust Blowers shut-off due to an event such as a Power Outage, gasses will still be monitored through the gas analyzers/sniffers.