Galvanneal Spiral Ductwork
24 Gauge Galvanneal Spiral Ductwork with Rectangular Taps and flange connection. Galvanneal Definition - Heat treating process alloys galvanized zinc coating to steel and provides good surface for immediate painting. No spangle to show through. Withstands temperatures to 750 degrees F without flaking - unlike ordinary galvanized. A60 and A40 coating available.