AccuFlange was designed with one overriding goal: to save field labor. Actual time studies reveal savings up to 50% compared to other systems. It's so simple! Once you try it, you will never go back. AccuFlange is available in singlewall and doublewall round configurations. Choose from galvanized, paintgrip, stainless steel, aluminum, or PVC coated materials. Meets or exceeds SMACNA standards.