AS 5330:2019 Drying cabinets for reusable medical devices
2.7.2  Circulating fan
The circulating fan shall be balanced and designed to be removable to allow cleaning and maintenance of the impeller and the interior of the fan casing. The fan shall have sufficient capacity to circulate enough air through the drying cabinet to achieve drying, with adequate pressure to discharge a proportion of this air to atmosphere through an exhaust vent [see Item (j), Appendix A]. Fans shall be made of corrosion resistant materials. A control shall be provided to interrupt the electrical supply to the fan and heater elements whenever any door is opened during operation, and to reconnect supply whenever all doors are closed during operation.
2.7.3  Air exchange
To reduce the amount of moisture in the air circulating through the drying cabinet, a proportion of this air shall be bled off by means of an adjustable damper suitable for the regulation of the airflow. The bleed-off discharge shall pass through an exhaust vent terminating at the top of the drying cabinet. The vent shall be connected to an exhaust system or to atmosphere. Fresh air replacing the discharged air shall be admitted to the drying cabinet through a filter.
2.7.4  Air filter
The quality of the air introduced into the drying cabinet shall not impair the cleanliness of, nor introduce microbial contamination to, the load.
When air free from bacterial or particulate contamination is necessary to fulfil this requirement, this may be achieved by the use of a HEPA (high efficiency particulate air) filter.
NOTE  HEPA filters (Class H13 or higher as specified in EN 1822–1:2009) are often used to remove bacterial contamination from an air supply. When they are used as general particulate filters, performance tests are not normally required on the installed filter.
2.8.1  General
Control equipment shall be enclosed, to prevent the ingress of moisture, dust, and other contaminants,and have a degree of protection of not less than IP 54.
Access shall be provided from the front panel, to allow for servicing and replacement of control equipment. Where control components are mounted independently of other controls, they shall be replaceable.
NOTE 1  Where practicable, other components should be of the plug-in type.
NOTE 2  Stage controllers should allow for the adjustment of stage temperatures, duration of stages, actuating mechanisms, microswitches, and other adjustable components.