Dental practices with several surgeries, oral surgery clinics, hospital outpatient departments, and day-surgery units run a 29- or 45-litre steam steriliser load with the HS-IC pair every cycle. GP practices offering minor surgery and veterinary hospitals use it in the same way. Because each layer is a tray in its own right, the two can hold separate sets, one patient's instruments below and another's above, or a batch of sealed pouches on each.
Stacking puts the chamber's height to work. The channel tray goes in with its layer spread across the floor, the flat tray rests across the channel's walls with a second layer, and steam reaches both through the holes in every surface. Condensate can drain through the perforated floors, which suits the drying phase that ends each cycle, and each layer stays a single, uncrowded spread of instruments.
Replacement works one tray at a time. Replace a Tray 1 or Tray 2 that bends or goes missing under its own code for the 29 or 45 litre size, and keep the other half of the pair in use. Load ceilings per tray come from the steriliser, cycle by cycle, and the trays come out hot enough to need a tray handle or a pause to cool.
Fit belongs to the chamber volume each pair is made for, so sterilisers of other sizes or chamber shapes need trays of their own. Cassette and container loads require different equipment. Tray handles, racks and the steriliser are separate items.