One of the most frequent problems we encounter when looking at a prospective cleanroom layout is that everything has been considered but how to return the air from the cleanroom back to the air handling unit. An inexpensive and simple way to return the air is with insulated ductwork located outside the cleanroom. Many owners react negatively to this concept thinking it ruins the cosmetic appearance of the cleanroom. With proper duct sizing and professional installation, ductwork on the outside is not ugly and is a cost effective way to return the air.
