Philadelphia, PA,
21:34 PM

New Glass Master SG-420 Machine from CertainTeed Grooves Spiral Duct Liners in Seconds

(MALVERN, Pa.) – CertainTeed Machine Works, a division of CertainTeed that offers a comprehensive line of commercial and residential insulation and fireproofing application equipment, has expanded its line of duct board grooving equipment with the new Glass Master SG-420 Duct Board Grooving Machine – a powerful machine that fabricates high-quality fiberglass spiral ducts faster and more accurately than ever – up to 50 times faster than standard hand-cutting techniques.

The SG-420’s nine drive rollers and ¾ horsepower motor provide the grip and power to quickly pull duct board through the 21 tools required to form spiral duct liner. Precision-ground and hardened tool blades produce clean grooves and consistent contours and duct dimensions.

“Creating spiral duct systems has been a challenge for many contractors, but now, it doesn’t have to be. Our new SG-420 machine provides the same industry-leading performance they’ve come to expect from CertainTeed Machine Works equipment in a much more versatile machine,” said General Manager Blair Gaida. “The SG-420 not only helps them create top-quality square and rectangular ducts, it also lets them tackle even the most complex spiral duct projects.”

Like the Glass Master SG-220 machine, the SG-420 is easily adaptable to groove 1", 1 ½" and 2" boards. Its square duct tool holders have a unique measuring tab for easy and accurate groove spacing. Quick-release clamps on all tools allow for fast repositioning. All machines come equipped with a foot-actuated switch for safe operation, four swivel casters, and a durable powder coat finish. For more information on CertainTeed Machine Works Glass Master products, visit



About CertainTeed

Through the responsible development of innovative and sustainable building products, CertainTeed, headquartered in Malvern, Pennsylvania, has helped shape the building products industry for more than 110 years. Founded in 1904 as General Roofing Manufacturing Company, the firm's slogan "Quality Made Certain, Satisfaction Guaranteed," inspired the name CertainTeed. Today, CertainTeed is a leading North American brand of exterior and interior building products, including roofing, siding, fence, decking, railing, trim, insulation, drywall and ceilings. A subsidiary of Saint-Gobain, one of the world’s largest and oldest building products companies, CertainTeed has more than 6,900 employees and more than 60 manufacturing facilities throughout the United States and Canada. The group had total sales of approximately $3.98 billion in 2018.