Available in a range of sizes and configurations, flat transitions for the top and left sides are fabricated with stiffening beads on duct sizes 19” wide and larger which have more than 10 square feet of unbraced panel. Our rectangular fittings come beaded, unless the duct has an insulation covering and an acoustical liner. This requirement is applicable to 20 gauge or less in thickness and 3” W.G. or less.
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