Duct Calculation Slide Rule (ACCA Ductulator)

This durable two-sided plastic sizing wheel comes with a complete instruction manual for residential and commercial duct-sizing procedures. Uses:  –  Sizes metal ducts, lined metal ducts duct board airways, and wire helix flexible ducts. –  Converts round shapes to equivalent rectangles. –  Correlates available pressure with total effective length and friction rate (Manual D sizing calculations). –  Converts velocity into velocity pressure and vice versa. –  Corrects for altitude and temperature.