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FDD is a bag filter specially developed for connection in bypass circuits of HVAC / R piping systems to keep water clean and to add chemical additives. FDD are made of stainless steel and equipped with a filter bag (with a supporting stainless steel sieve closed at the bottom) into which conditioners and chemical additives can be added as required.
FDD filters are available in two sizes ("D" and "S") and are supplied with a vent valve on the lid, a hand-operated flush valve at the bottom, two pressure gauges and an adjustable support foot. The lid lock is designed with pivot pins to facilitate cleaning, changing the bag or refilling with chemical additives (in accordance with the UNI 8065 and UNI 8884 standards and the 97/23 / EC directive).