Rectangular or round galvanized duct – indicative engineering tool by
Indium.
Duct type:
Units:
Currency:
Application:
(m)×pcs
Total duct length = piece length × quantity.
Changing units will reset inputs to avoid mixing metric and imperial
values.
Results
Preliminary estimation – for engineering checks only. Final design must
be verified against project specifications and standards.
Air velocity
-m/s
Airflow
-m³/h
Friction loss in straight duct
-Pa/m
Total pressure drop (approx.)
-Pa
Duct surface area
-m²
Estimated duct cost
-USD
Velocity & noise check
No data – enter inputs above and press Calculate.
Friction loss vs. air velocity
Red point = current selection. Green point = recommended velocity band
for the selected application.
Recommended air velocities (indicative – ASHRAE style)
Typical design ranges (m/s) for main supply ducts. Values are for quick
checks only and must be verified against project specifications and
local codes.
