Information

Convert pressure units of fans and ventilation systems

What is pressure?

Pressure is a fundamental concept in physics that refers to the amount of force per unit area that a substance or object exerts on another surface. Simply put, it is the force applied perpendicularly to the surface of an object divided by the area of that surface. Pressure can be defined as the amount of force distributed over a given surface.

Pressure plays a crucial role in many different areas of science and engineering, including fluid mechanics, thermodynamics and atmospheric science. In these fields, pressure is a crucial parameter that must be carefully controlled and monitored to ensure the effectiveness of systems.

In ventilation systems, pressure is an essential aspect to ensure that the system works effectively. These systems are designed to move air from one place to another, for example in a building or industrial environment. The pressure of the air in the system affects how the air moves, which is crucial to ensure that the system functions as intended.

Pressure in ventilation systems is an essential aspect to ensure the system works effectively. Ventilation systems are designed to move air from one place to another. The pressure of the air in the system affects how the air moves, which is important to ensure that the system works as intended.

In short, pressure is an essential concept that plays a vital role in various scientific and engineering disciplines. Understanding the principles of pressure is crucial to optimising the performance of ventilation systems and ensuring their effectiveness.

Formula

To calculate pressure, we use the formula:

Pressure = Force / Area.

This formula states that pressure is directly proportional to the force applied and inversely proportional to the area over which that force is distributed. Therefore, if the same force is applied to a smaller surface area, it results in a higher pressure.

Conversion factors

The SI unit for pressure is the pascal (Pa), which corresponds to a force of one newton per square metre (N/m²). Other commonly used units for pressure include pounds per square inch (psi), bar and torr.

The relevant units for pressure in ventilation systems are tabulated below.

Abbreviation Unit
Pa
Pascal
N/m²
newton per square metre
mm H2O
millimeter of water
mbar
millibar
bar
bar
in H2O
inch of water
ft H2O
feet of water

Conversion table

Pressure unit Pa N/m² mm H2O mbar bar in H2O ft H2O
1 Pa
1
1
0,10197
0,01
0,01
0,0040146
0,003345
1 N/m²
1
1
0,10197
0,01
0,00001
0,0040146
0,0003345
1 mm H2O
9,8067
9,8067
1
0,098067
0,000098067
0,03937
0,0032808
1 mbar
100
100
10,0197
1
0,001
0,40146
0,0033455
1 bar
100.000
100.000
10197
1000
1
401,46
33,455
1 in H2O
249,09
249,09
25,4
2,4909
0,0024909
1
0,08333
1 ft H2O
2989,10
2989,10
304,8
29,981
0,029891
/
1

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