ThermoFlo Insulated Ducting, 4″ – 25′

ThermoFlo’s SRB Series is industrial quality insulated ducting manufactured tough for consumers’ and installers’ peace of mind. Consisting of three-ply polyester laminate, fiberglass reinforced scrim, and a galvanized spring steel wire—all wrapped with fiberglass insulation—it provides an outstanding combination of strength and tear resistance.