About the Trane TD1 Ductulator with Sleeve
The Trane TD1 Ductulator is the industry-standard circular slide rule calculator used by HVAC professionals worldwide for accurate duct sizing calculations. This free online version replicates all the functionality of the physical Trane ductulator, allowing you to:
- Calculate duct sizes based on airflow (CFM) and friction loss
- Determine air velocity for any duct configuration
- Convert between round and rectangular duct dimensions
- Find equivalent duct sizes with different aspect ratios
- Work in both Imperial (SI) and Metric units
No download required. No physical ductulator needed. Instant calculations at your fingertips.
Interactive Ductulator Calculator
Align the values below just like you would with a physical Trane TD1 Ductulator
Visual representation of the Trane TD1 Ductulator scales
Duct Sizing Calculator
Enter any two known values to calculate duct dimensions
Additional Ductulator Functions
Round to Rectangular Equivalency Calculator
Convert between round and rectangular ducts with equivalent airflow characteristics (per ASHRAE standards)
Air Velocity Calculator
Calculate air velocity based on duct size and airflow rate
Friction Loss Calculator
Calculate pressure drop due to friction in ductwork
Ductulator Reference Guide
Recommended Air Velocities
| Application | Velocity (FPM) |
|---|---|
| Residences | 600-900 |
| Apartments | 700-1000 |
| Private Offices | 1000-1300 |
| Banks & Libraries | 1000-1500 |
| General Offices | 1200-1800 |
| Retail Stores | 1500-2000 |
| Industrial | 1800-3000 |
Friction Loss Guidelines
| System Type | Friction (in w.g./100 ft) |
|---|---|
| Low Pressure | 0.08-0.10 |
| Medium Pressure | 0.10-0.15 |
| High Pressure | 0.15-0.30 |
Standard Duct Sizes (inches)
| Round | Rectangular |
|---|---|
| 6, 8, 10 | 6×6, 8×6, 10×6 |
| 12, 14, 16 | 12×6, 14×8, 16×8 |
| 18, 20, 22 | 18×10, 20×10, 22×10 |
| 24, 26, 28 | 24×12, 26×12, 28×12 |
Quick Conversion Factors
| 1 CFM | = 0.4719 L/s |
| 1 inch | = 25.4 mm |
| 1 FPM | = 0.00508 m/s |
| 1 in w.g. | = 249.1 Pa |
| 1 sq ft | = 144 sq in |
Frequently Asked Questions
What is a Trane TD1 Ductulator?
The Trane TD1 Ductulator is a circular slide rule calculator specifically designed for HVAC duct sizing. It helps engineers and technicians quickly determine duct dimensions based on airflow, velocity, and friction loss requirements. The TD1 model includes a protective sleeve for durability.
How accurate is this online Trane ductulator calculator?
This digital calculator uses the same ASHRAE-standard formulas as the physical Trane TD1 Ductulator, providing professional-grade accuracy for all calculations. Results match those from the physical slide rule within acceptable engineering tolerances.
Can I use this calculator for both round and rectangular ducts?
Yes! Just like the physical Trane ductulator, this online version handles both round and rectangular duct calculations, including equivalent diameter conversions and various aspect ratios.
What units does the Trane TD1 Ductulator Calculator support?
This calculator supports both Imperial units (CFM, inches, FPM, in w.g.) and Metric units (L/s, mm, m/s, Pa). Toggle between units using the switch at the top of the page.
Do I need to download or install anything?
No! This is a completely web-based calculator. No downloads, no installation, no registration required. Simply visit this page and start calculating.
Is this calculator suitable for professional HVAC design work?
Yes, this calculator is based on industry-standard ASHRAE formulas and can be used for professional HVAC design. However, always verify critical calculations and comply with local building codes and engineering standards.