FM Approval
	Fab-Tech, Inc's Model PermaShield Pipe fume and/or smoke exhaust duct materials (circular stainless steel duct interiorly coated with an electrostatically applied fluoropolymer resin) are FMRC approved up to a maximum 60 inch (1524mm) diameter when manufactured in accordance with S.M.A.C.N.A. Round Industrial Duct Construction Standards.
	Limitations & Requirements:
	1.	All ducts shall be interiorly furnished with a fluoropolymer resin coating consisting of a prime coat 2 to 3 mil (0.05-0.07mm) thick and a top coat 7 to 8 mil (0.18-0.20mm) thick.  The total interior coating thickness shall not exceed an average of 10 mil (0.25mm).
	2.	This duct may be used for smoke removal in special purpose areas when properly designed and sized.  Sprinklers are not required.
	3.	The product shall be manufactured with identical resins as tested, and according to the formulation on file with FMRC, and shall meet all physical requirements of S.M.A.C.N.A. manual for Industrial Duct Construction Standards.
	4.	Vertical height of individual risers within the duct system are not restricted, however, they shall not penetrate other fire areas.
	5.	The manufacturer shall determine the suitability of the duct system for specific corrosive environments.
	6.	If the process served by such duct system produces flammable residue or a combustible fume source exceeding 1 square foot (0.09m) in area per inlet which can build up inside the duct, then internal sprinklers will be required.
	7.	The ASTME 84 Standard Test Method for Surface Burning Characteristics.  Tested in flat sheet form at a 20 ga. (0.95mm) thickness:  Flame Spread 10, Smoke Density 15.
		Caution:  These numerical flame spread and smoke density values do not define the hazards presented by this of any other material under actual fire conditions.