PermaShield Pipe (PSP®) Ductwork Fabrication Standards
	The Fab-Tech Ductwork Fabrication Standard Manual is designed to aid you, our customer, in becoming acquainted with our fabrication practices.  The manual is in strict accordance with the practices in the latest S.M.A.C.N.A. manuals.
	GENERAL
	Codes and Standards
	a.	Ducts shall be listed for use without the necessity for internal fire protection sprinklers or any devices relied on to cut off air flow in the event of fire by the following:
		Factory Mutual Research Standard 4922
		Limitations and Requirements:
		1.	All ducts shall be interiorly furnished with fluoropolymer thermoplastic resin.  The total interior coating thickness shall not exceed 12 mil (0.25mm).  Complete and uniform coating coverage is required.
		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 systems 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 (0.09 square meter) in area per inlet which can build up inside the duct, then internal sprinklers will be required.
		7.	ASTM-84 Standard Test Method for Surface Burning Characteristics.  Tested in flat sheet form at a 20ga. (0.95mm) thickness:  Flame Spread 0, Smoke Density 20.
	b.	Fab-Tech's FM Global Approval ( 4922 ) extends the widest possible limits from 4" diameter ( 100mm ) up to and including 60" diameter ( 1525mm ) duct and fittings.
	DUCTWORK
	a.	Base Metal shall be a series 300 stainless steel.  Longitudinal seams shall be fusion welded.  Transverse seams shall be continuous weld.  All seams shall be smooth on the interior of duct.
	b.	Coating shall be PermaShield Fluoropolymer Barrier Coating and shall be applied per Factory Mutual Research Corporation's limitations and requirements.
	c.	Testing shall be performed at the factory over the entire coated surface inside and out (where applicable) and edges.  The testing shall be performed with a DC spark tester used at 2500 volts.
	d.	Delivery, Storage, and Handling:
		1.	Protection: Protection is factory applied to ends of ductwork to prevent end damage and prevent dirt and moisture from entering ducts and fittings.
		2.	Delivery: Consignee must inspect shipment upon delivery and note any and all damages and discrepancies on Bill of Lading and notify manufacturer within 24 hours.
		3.	Storage: Coated ductwork should not be stored in an area where it will have a chance to be damaged from traffic or debris.  All coated ductwork should be stored on cardboard, styrofoam or similar materials.  Where possible, store inside and protect from dirt and debris.  Where necessary to store outside, store above ground and enclose with water proof wrapping to protect from dirt and debris.
		4.	Handling: If coating is scratched use appropriate protocol to "spark test" (refer to Installation and Assembly Guide, Field Modification section) and if spark is detected, contact manufacturer for repair instruction.
		5.	Welding: Under no circumstances shall welding or a heat source greater than 300°F (150°C) be allowed on the stainless steel surface of the duct.
	e.	Duct Assembly shall be accomplished utilizing either companion flange rings or Fab-Tech's PSP-EZ™ clamp:
		1.	Companion flange rings are available in sizes 4" thru 120".  The minimum number of holes for flange connection is one hole for each 4" of duct circumference to the next higher number.
		2.	PSP-EZ™ clamps are available in sizes 2" thru 14".  The PSP-EZ™ band ring style of joining system shall provide a minimum compression load to the gasket of 900psi.
	f.	Gasket Technology:
		1.	Ring gasket material shall be a form in place, fully expanded 100% PTFE joint sealant.
		2.	PSP-EZ™ clamp gasket material shall be a form in place, fully expanded 100% PTFE tape or die cut gasket (2"-3" diameter).
		Fab-Tech reserves the right to change or modify specifications without notice.  PSP® and PSP-EZ™ are registered trademarks of Fab-Tech, Inc.