Schweigen SteelFlex is an ultra-strong and flexible high-performance safety ducting designed for quiet and efficient high-volume transfers of temperature-sensitive air. Lifetime Guarantee: Enjoy peace of mind with limited lifetime warranties. Superior Performance: Independently tested to offer unbeatable strength and safety for even the most demanding industrial and commercial HVAC applications. Quieter: Acoustically damped for extreme low resonance turbulence and noise. Bacteria Shield: Treated with an advanced antimicrobial coating to resist pollutant build-up and the spread of surface bacteria. Mould Resistant: Inoculated against mould and mildew growth to ensure product integrity and performance in high-humidity operating environments. Temperature Resistant: Tested between -10ºC and 80ºC toperform optimally across a wide range of operating environments. Fireproof: Designed with Shirikon Firemesh® for optimal protection against ignitability flame propagation heat and smoke release. Pest Proof: Integrated braided mesh and metal tape reinforcement protects ductwork against even the most desperate and vicious rodents. Crush Proof: Robustly constructed to withstand impact without tear rip collapse or separation in excess of industrial tolerances. Tear & Puncture Proof: Engineered for anti-penetrative strength and flexibility in industrial applications. Safer & Easier to install: Comes right-sized and ready-cut for quicker and safer installs by specialists and DIY enthusiasts alike.