To make cutting flexible duct easier, Malco makes one wicked looking cross between an insulation knife and a pair of wire snippers. Simply grab the non-slip vinyl handles and use the double-edged stainless steel blade to easily slice through the insulation. Finish the cut by snipping the inner rib coil with the compound action wire cutters.
At $30 or so, this might not be for just anybody’s toolbox, but if you’re installing an HVAC system this tool could save you some time. Just be careful carrying this bad boy in your tool pouch.