Reviews & Guides

What is CFM for a Blower?

  • Date: September 10, 2021
  • Time to read: 2 min.

What is CFM for a Blower?

Lawn maintenance is a hectic job but thank heavens we don’t have to rake leaves these days anymore. With sophisticated leaf blowers in the market, garden-keeping has become a whole lot easier.

However, while buying a leaf blower that is suitable for you, it is important to read up a bit on what those specifications on the box actually mean. This will make the buying process less confusing and ensure you end up with the right machine for a spotless lawn.

One of the main specs on any leaf blower is its CFM (cubic feet per minute).

But what does it mean, and how is it different from the MPH (miles per hour) value that is also written on the box?

What is CFM?

CFM is an abbreviation for Cubic Feet per Minute, and cubic feet is a unit of volume. So, essentially, the CFM value tells us what volume of air is thrown out by the blower every minute.

This is a measure of how powerful the blower is – the higher the value the better. So, a blower with a CFM of 120 would be able to displace 120 cubic feet of leaves every minute (given that the air is also coming out at high enough speed).

The volume of the air expelled would depend largely on the size of the nozzle. A blower with a tiny nozzle may be expelling air at an extremely fast rate, but the thin, tiny jet of air simply would not have enough amount or “volume” of air to blow the leaves off.

On the contrary, a blower with a bigger nozzle would be able to push more air out every minute, hence providing more force to do the job.

So you need to look for high CFM specification on a blower.

How is CFM different from MPH?

MPH (miles per hour) is the speed with which air is ejected from a blower. In the above examples whenever we talked about blowing air faster or slower, we meant the MPH.

So MPH is how fast, while CFM is how much.

We need high MPH for better performance too. Imagine a blower with a huge nozzle and considerable CFM rating, but very low air speed. If the air isn’t moving fast, it won’t be able to move leaves fast, or at all.

Overall power

To judge the overall power of a blower, one way is to multiply the two readings (CFM and MPH) and judge which blower has a more powerful combination.

You should also look at them separately since some types of loads might require more of one over the other. Generally, CFM values above 300 are considered good power, and MPH values above 100.