System Pressure Calculator

Select Spiral diameter, enter the volume and units, then the quantities for fittings. Answers are shown in the green boxes.

Volume Unit Converter

Enter the volume and unit above

m³/s

0.100

L/s

100.0

m³/hr

360

cfm

212

Pipe Diameter Calculator

Velocity wanted

m/s

Duct diameter you need

113

mm Ø

Diameter Pipe used

Velocity in specified size pipe

1.3

m/s

Equivalent Size Calculator

Enter Duct Dimensions

Equivalent Size

451

Dia

Enter Diameter

Equivalent Size

177

Square

Enter Rectangular Sizes

Equivalent Size

283

Square

System Pressure Calculator

Duct Diameter

Vel in m/s

6.37

Quantity

Resistance

Notes

Lengths of Spiral in m

Pa/m

90° Bends - Segmented

Pa each

90° Bends - Pressed

Pa each

45° Bends - Segmented

Pa each

45° Bends - Pressed

Pa each

Fully Extended Flex in m

Pa/m

90° Flexible Bend

Pa each

Reducer (depends on amount)

Pa each

Saddle (50% of Main)

Pa each

Curved Boot (50% of Main)

Pa each

Tee (supply from branch)

Pa each

Y Piece

Pa each

Duct Heater

Pa each

Attenuator - 600mm long

Pa each

Filter Cassette (Clean)

Pa each

Air Valves & Diffuser*

Pa each

EC / SD / DD Grille*

Pa each

Weather Louvre**

Pa each

Lengths of Spiral in m (Pa/m)

Pa/m

Pa/m (flex)

TOTAL RESISTANCE (in Pascals)

0.00