Ophi Pro
FR
Pressure
Duct
Plumbing
Electrical
Fire
Converter
About
Flow → Size
Size → Flow
Duct Sizing Calculator
Flow Rate (m³/h)
Velocity (m/s)
2.0
2.5
3.0
4.0
5.0
6.0
8.0
Custom
m/s
Shape
Circular
Rectangular
Aspect Ratio
1:1
1.5:1
2:1
3:1
4:1
Roughness (mm)
Copper (0.05)
Steel (0.15)
Concrete (0.5)
Live Preview
Ø200 mm
Diameter
200
Velocity
4.0
Friction
-
Calculate Size
Result
OK
Standard Suggestions:
Flow Rate from Size
Shape
Circular
Rectangular
Diameter (mm)
Width × Height (mm)
Target Velocity (m/s)
Resulting Flow
Ø200
Flow Rate
-
Area
-
Air Changes per Hour
Required airflow = room volume × air changes per hour. Confirm the ACH target against the applicable design standard.
Room Length (m)
Room Width (m)
Room Height (m)
Air Changes (ACH)
Calculate Ventilation Flow
Weight Estimator
Type
Circular
Rectangular
Diameter (mm)
Perimeter (mm)
Length (m)
Material
Galvanized Steel
Aluminum
Stainless
Thickness (mm)
0.5
0.8
1.0
Calculate Weight