Velocity Calculator

The Fox Velocity Calculator is a helpful tool. This Calculator can help you determine whether a Fox Meter is right for your application.

Directions for use:

Choose the pipe shape

Choose standard or metric flow units

Click “Submit”

Enter pipe/duct size

Enter maximum flow rate

Click “Submit query”

Compare Calculator results with the table below. If your velocity results exceed the numbers in the table or your gas type is not listed, contact a Fox Application Specialist at (831) 384-4300 or sales@foxthermalinstruments.com.

Velocity Calculator
Input
Pipe Shape
Units






Maximum Flow Velocity

Gas Type	(SFPM)	(NMPS)
Air	60,000	300
Ammonia	54,000	275
Argon	60,000	300
Carbon Dioxide	60,000	300
Carbon Monoxide	60,000	300
Digester Gas	45,000	225
Ethane	40,000	200
Helium	36,000	185
Hydrogen	24,000	125
Methane	45,000	225
Natural Gas	45,000	225
Nitrogen	60,000	300
Oxygen	60,000	300
Propane	20,000	100