# Is FPM and CFM the same?

## Is FPM and CFM the same?

FPM refers to the “air speed” produced by a dryer, as measured in Feet Per Minute. CFM is a measure of the “air flow,” stated in Cubic Feet per Minute. In other words, FPM is a measurement of how fast the air moves and CFM measures how much air is moved.

### What is FPM air velocity?

Air velocity (distance traveled per unit of time) is most often expressed in feet per minute (FPM). Multiplying air velocity by the area of a duct allows you to determine the air volume flowing past a point in the duct per unit of time.

#### How do you calculate FPM in aviation?

If you multiply your descent angle (1 degree) by your miles-per-minute, then add two zeros to the end (x 100), you’ll have your FPM descent rate. So in this example, if you’re flying at 120 knots, you’re traveling 2 miles-per-minute (MPM) (120/60=2).

**What is FPM in HVAC?**

Air velocity (distance traveled per unit of time) is most often expressed in feet per minute (FPM). Multiplying air velocity by the area of a duct allows you to determine the air volume flowing past a point in the duct per unit of time. Volume flow is generally measured in cubic feet per minute (CFM).

**What does FPM mean in HVAC?**

feet per minute

In HVAC/R applications it is helpful to understand the methods used to determine air velocity. Air velocity (distance traveled per unit of time) is most often expressed in feet per minute (FPM).

## What is the velocity of 500 CFM of air moving through a 10 in duct?

The airflow is 500 CFM. What is the air velocity in the ducts? If you input all these numbers in the calculator above, you get 500 FPM (that’s 5.7 mph). You can use both of these calculators freely to help you design ductworks for central air conditioning systems, for example.

### How do you calculate fpm descent?

#### What is CFM and FPM?

FPM stands for feet per minute and is a unit of measure that describes length per unit time. CFM stands for cubic feet per minute and is a unit of measure that describes volume per unit time. To convert between the two, the length in FPM must be multiplied by the area to get volume.

**What is the recommended FPM for return duct systems?**

Return Grille Sizing The speed of the air moving through of a return grille should typically be kept in the 300 FPM (Feet per Minute) to 500 FPM range to reduce noise through the grille.