Every building in the world utilizes fans.
Fans are one of the most basic machines…but they can be easily misunderstood.
Fans are rated in CFM (cubic feet per minute) for air flow. One CFM is one cubic foot of air being moved through a fan or piece of ductwork in a one minute time.
Static pressure is the measure of the amount of pressure required to move a specified amount of air (CFM) through a piece of ductwork.
Horsepower (HP) is the amount of work a machine can perform in a period of time. One HP equals 33,000 foot/pounds of work per minute also equal to 746 kw.
Brake horsepower is the amount of horsepower required to move a fans wheel to produce a required flow and pressure. This is a consumption rating as compared to the production rating of horsepower itself.
There are many different types of fan wheel designs which offer air flow characteristics specific to the design. This allows for a broad range of product coverage for any application.
There are three fundamental rules governing fan performance, these are called “Fan Laws”. The performance can be calculated for different conditions.