Cleanroom pass thru’s are used to transfer product from inside to outside the cleanroom without going thru doors. A cleanroom pass thru is an airlock with two doors. The doors are typically interlocked so only one door can be opened at a time. This prevents the cleanroom from being open to the dirty outside space and reduced the number of particles entering the cleanroom.
Cleanroom pass thru materials include plastic laminated wood, painted steel or stainless steel. Stainless steel is used for chemical resistance when a pass thru is subject to harsh chemical cleaning. The cleanroom pass thru windows are typically plexiglass or tempered glass depending on the size of the pass thru.
Pass thru interlocks can be mechanical for smaller sized pass thru’s and magnetic for larger sized pass thru’s.
HEPA filtration is sometimes added on cleanroom pass thru’s when the pass thru connects the outside to a higher class cleanroom space (ISO-6/class 1000 or ISO-5/class 10k).
Wall mounted pass thru’s are the most common cleanroom pass thru. Typically 2’x2’x2’ mechanically interlocked doors. The doors are see thru so the operator can tell if there is something in the pass thru. The pass thru’s also come in custom sizes from as small as 1’x1’x1’ to as large as 3’x3’x3’. The smaller the pass thru the less contamination will enter the cleanroom each time it is used.
Figure 1. Cleanroom wall pass thru – 2’x2’x2’
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