What is the ideal placement for a tacky/sticky mat?

Tacky/sticky mats should be placed on the outside of the cleanroom. Entry ways, gowning and buffers areas are ideal. Place it in a location where several steps can be made on the mat before opening the door

What cleanroom class requires the use of tacky/sticky mats?

There are no specific requirements for the use of tacky mats. However, using tacky/sticky mats helps maintain your controlled environment so they should be used upon entry into ALL controlled environments. Using white tacky mats for cleaner environments can help identify when the mat needs to be changed as opposed to a darker color such as blue.