Designed to handle offsets, BlitzFlex from Centrotherm Eco Systems allows for a continuous run of the air-intake system for any residential heating appliance. Made from flexible polymer, it comes in an easy-to-dispense BlitzPack master carton. It can be dispensed from its master carton as needed at the point of use, eliminating a bulky and unwieldy coil. A single carton provides enough air-intake conduit to complete three to five standard residential systems. Available in 2-, 3- and 4-inch diameters, it can save time and money on installations. 518-434-3400; www.centrotherm.us.com.