3M Steri-Vac GS Series - Exhaust Ventilation System Specifications; Ductwork; Exhaust Fan; Ventilation Failure Detector

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70-2011-5643-0 Issue Date: 10/2015
3M
™
Steri-Vac
™
Sterilizer/Aerator GS Series
Site Planning and Installation Guide
Exhaust Ventilation System Specifications
The following ventilation system requirements must be met to ensure maximum air movement through
the hood.
Air flow Single Door Unit: Minimum of 3.5 cubic m/min (125 scfm) to the exhaust
hood connection, or a minimum of 350 m/min (1435 ft/min) in the
102 mm (4 in) line to the exhaust hood connection. Maximum air flow
through the hood is 7.0 cubic m/min (250 scfm).
Double Door Unit: Minimum of 7.0 cubic m/min (250 scfm to the exhaust hood
connection, or a minimum of 700 m/min (2870 ft/min) in the 102 mm (4 in)
line to the exhaust hood connection. Maximum air flow to the exhaust hood
connection is 14.0 cubic m/min (500 scfm).
Hood connection 102 mm (4 in) outside diameter
Ductwork
• Use metallic ductwork rated to handle the highest pressure that the system delivers. Use a minimal
amount of flexible, air-tight duct. A flexible duct can introduce significant air flow resistance.
• Use a larger diameter flexible duct to minimize frictional air drag loss.
• Minimize the number of elbows to reduce the static pressure loss in the system.
• Seal duct seams and joints with aluminum duct tape or sealant to prevent leaks. The duct does not
have to be gas tight.
• Ensure the ductwork material is impervious to ethylene oxide(EO).
Exhaust Fan
• Use a centrifugal fan with backward curved blades designed for continuous operation.
• Use a high efficiency spark-proof fan with the motor sealed from the exhaust air stream.
• Use an impeller and impeller ring around the drive shaft that is nonferrous.
Ventilation Failure Detector
An air flow sensor is installed in the exhaust opening of the hood as standard equipment. The sensor
detects low air flow in the exhaust hood and activates a Caution message (E501 - Exhaust Hood
Air Flow) to alert personnel of ventilation system failure. This Caution message does not stop the
sterilization cycle in progress, but will cause the performance of an automatic three-hour locked,
mandatory aeration. The ventilation problem must be corrected in order to clear the Caution message.