The Trane TD1 Ductulator with Sleeve is the definitive, industry-standard rotating slide calculator used by mechanical engineers, HVAC contractors, and system designers to quickly size supply and return air ductwork. Operating on the equal friction design method, this indispensable field tool allows users to accurately calculate airflow volume (CFM), air velocity (FPM), friction loss per 100 feet, and equivalent round or rectangular duct dimensions in seconds. Housed in a heavy-duty protective sleeve featuring ASHRAE-recommended design air velocities for various applications, it serves as a core hands-on reference for job-site execution, airflow diagnostics, and state contractor licensing exams.  
 
Key Features
Equal Friction Calculation: Instantly matches CFM airflow requirements with velocity and friction loss to size supply and return duct systems accurately.  
Dual-Sided & Dual-Unit Scale: Includes standard English (I-P) calibrations on one side and Metric (SI) units on the reverse for versatile job-site and engineering applications.
Round-to-Rectangular Conversion: Easily converts round duct diameters to equivalent rectangular width and depth dimensions without complex manual math.
Protective Reference Sleeve: Includes a durable sleeve printed with ASHRAE-recommended design air velocities for common system components and building applications.  
 
Trane TD1 Ductulator with Sleeve is used on Florida's CMC (Certified Mechanical Contractor) and CAC (Class A & B Certified Air Conditioning Contractor) licensing exams. Brand new mint condition, current editions used on the exam at the time of purchase. Pre-Tabbed options available for Quick Navigation.