Floor drains would not normally be specified in ISO Class 7 or higher categories of clean room, and as a general rule they should be minimized wherever possible. If unavoidable, they should be finished flush with the floor, constructed of stainless steel (grade 316 is normally acceptable), and be complete with a removable airtight solid cover. Proprietary clean-room types should be used that allow a designed integration with the floor finish and have an integral trap removable from above the floor via the access cover. Equipment installed in pharmaceutical clean rooms should not be plumbed directly into floor drains.
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