DESCRIPTION AND MATERIALS: Single wall round duct made in galvanized steel gauges 18 to 26 according to size. With spiral seam lock and standing ribs. Standard length: 8 ft.

FINISH: +Normal(galvanized) +Painted B +Ready for paint.

SELELECTION AND PERFORMANCE CHART: Underwriters Laboratories certifies spiro rib calibre 28 from 4” to 60” Diam., Supports from -3 to +10 wg and classified UL listed 181 class 0 air ducts
Mh12208 Vol. 3 11/16/83. Specifications SMACNA 95 + 2” wg.