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★★★★★
Average rating on the App Store. Apple doesn't publish how many ratings each star has.
Where this app stands in Malaysia, updated 17 Oct 2026
Top free
Not in this chart today
Top paid · All apps and games
#55 ▼46
| Date | Paid |
|---|---|
| 17 Oct 2026 | #55 |
| 16 Oct 2026 | #9 |
| 15 Oct 2026 | #49 |
| 14 Oct 2026 | — |
Best rank in each country today. Click a country to see its graph.
* UI Improvements and minor bug fixes.
Size HVAC ducts instantly using airflow, friction or velocity. Get accurate duct dimensions in seconds — no charts required. • Get a range of suitable duct sizes based on friction rate or velocity. • Get multiple valid duct dimensions instantly. • Tap on Friction Rate or Velocity to toggle between calculation methods. • IP and SI units. • Detailed sizing mode to adjust the duct dimensions and air flow rates. • Supports rectangular, circular and flexible ducts. • Automatic friction and velocity updates. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel or non-metallic flexible ducts. Any feedback is welcome, and will be the basis for future updates.