For over three decades, Rossi has lead the innovations in air volume regulators – more commonly known as dampers. We designed the first ever round damper blades with a continuous bar, replacing flimsy spring loaded blades and eliminating install times. Then, we introduced our Twistlock regulator as a replacement for wingnut-locking handles which vibrate loose, rattle & disrupt the air balance. Next, our snap-in bushings changed the game in damper assemblies, eliminating leakage and saving time & labor. Most recently, our patented positive locking regulators, the Everlock and the Megalock disrupted the industry yet again. Now, you can just set it and forget it, knowing your air balance is locked in place. All Rossi components (regulators, bushings, blades & bars) are designed to assembly together in under 90 seconds (our “speedy assembly”) to save you time & labor in your duct shop.