Fab-Tech PermaShield™ is the trade name for Exentec's process fume exhaust duct which contains our hybrid fluoropolymer interior coating.

PermaShield is a leading product in the industries we serve for many reasons.

• Our fluoropolymer barrier coating is less expensive than exotic metal alloys and has even played a role in reducing insurance premiums.
• PermaShield duct is designed to be easily installed with multiple joining system options including the fast and secure EZ Clamp system which can save up to 50% in installation time.
• We can manufacture duct from 2” to 120” in diameter to meet your project needs. 
• Approved for use without interior sprinklers, PermaShield installs quickly and easily with no mess. There is no welding, grinding, sanding or chemicals required for assembly and installation.
• PermaShield requires less installation labor compared to fiberglass reinforced plastic and additional labor savings can be realized using Exentec's proprietary EZ clamps.
• Smaller diameter PermaShield duct can also be easily shortened in the field for final fit up measurement needs.

Exentec offers an extensive selection of accessories and flexible design capabilities including modular options, allowing our customers the ease of one-stop shopping. Our PermaShield duct is manufactured in-house delivering shorter lead times, and we can provide custom fabrication to help our customers realize their process system goals. PermaShield by Exentec is a pre-engineered, highly configurable product. Most product configurations are available from our easy-to-use order sheets. For more advanced or unusual configurations, Exentec’s engineering department stands ready to assist with over 50 years of combined experience in corrosive fume exhaust design. 

The coating applied to PermaShield products can be described as the highest performing chemical- and impact-resistant coating available today. With nearly three decades of proven service in harsh environments, our coated stainless steel duct systems are ideal for safe and reliable removal of harmful process exhaust fumes. Our PTFE Gasket System provides superior joint sealant technology, permitting “a no-leaks duct system“ that has “0“ Flame Spread as determined by ASTM E84 Testing. PermaShield also holds FM Approvals Standard 4922 certification, assuring its ability to limit flame and smoke propagation and maintain its structural integrity. Our fume exhaust duct systems contribute to the overall safety of high-tech facilities as well as the safety of facility employees by preventing airborne contamination, fluid leakage, or total system failure in the event of a fire. 

Many of the chemicals and solvents that are easily contained by PermaShield fluoropolymer barrier coating can cause rapid deterioration of other plastics and all but the most exotic metal alloys.  Chemical compatibility data is available from Exentec for over 500 chemicals.