The company has extended its SPIROsafe® line of self-sealing round duct systems to include diameters up to 60 in. The line was previously available in diameters to 50 in. The line’s increased range, says the company, will expand its capabilities on larger projects. Both single- and double-wall models are offered. Lindab, Inc., Two Stamford Landing, Stamford, CT 06902; 203-325-4666; 203-325-2111 (fax); (Web site).