ACCA Ductulator – Duct Calculation Slide Rule

• • The ACCA Ductulator—officially titled the ACCA Duct Calculation Slide Rule—is a mechanical duct-sizing tool developed by the Air Conditioning Contractors of America (ACCA). It is a slide-rule-style calculator designed for HVAC professionals to assist in accurate duct sizing for residential and light commercial air distribution systems, using methods outlined in ACCA Manual D. This tool has been widely used since its introduction and remains a staple in the HVAC industry due to its simplicity, accuracy, and portability.

• Key Aspects:

• • • Duct Sizing for Round and Rectangular Ducts
    • Quick Manual Calculations
    • Adjustable Friction Rate
    • Air Velocity Reference
    • Equivalent Rectangular Sizing

• Highlights:

• • Designed to Work with ACCA Manual D
  • Lightweight, Portable, Durable
  • Helps size ducts to balance efficiency, noise levels, and velocity.
  • Useful for fitting ducts into architectural constraints.

About Hank Rutkowski

Designed by Hank Rutkowski, a licensed professional engineer and a prominent figure in the HVAC industry. Rutkowski has authored several technical manuals, including those published by the Air Conditioning Contractors of America (ACCA), such as Manuals J, D, N, and Q. His work focuses on providing standardized methodologies for HVAC system design, aiming to improve system performance and energy efficiency.