How Does a Leaf Blower Work?

On this page (10 sections)

1. What parts make a leaf blower work?
2. How does the fan move air through the blower?
3. Why does the nozzle make the air come out faster?
4. What is the difference between CFM and MPH?
5. How does a gas leaf blower work?
6. How does an electric or corded leaf blower work?
7. How does a battery leaf blower work?
8. What makes one blower stronger than another?
9. How do you use the airflow to clear a yard?
10. Which type of leaf blower fits your yard?

A leaf blower works by spinning a fan inside a housing so it pulls in air and forces it out through a narrow nozzle. The motor drives the fan, the housing and nozzle speed the air up, and that fast stream pushes leaves off the ground.

Every gas, corded and battery model follows the same idea. The differences come down to how the fan is driven and how the air is shaped.

Once you see how a leaf blower works, the CFM and MPH numbers on a box stop looking like random specs. This guide walks through each part in order.

The EGO LB7654, the WORX WG520 and the WORX Trivac WG509 appear where each one fits the job.

What parts make a leaf blower work?

The main parts are an air intake, a fan, a motor, a housing and a nozzle. Air enters at the back, the spinning fan throws it outward, and the housing guides it into the tube.

The motor is the only part that creates motion. On a gas blower the motor is a small two-stroke or four-stroke engine.

On a corded model it is an electric motor fed by a cord. On a battery blower it is a brushless or brushed motor running off a rechargeable pack.

The fan sits on the motor shaft, so the two spin together. A wide intake grill lets air in while keeping out twigs and grit.

The housing, sometimes called the volute, is a curved shell that collects air at the fan edge. The nozzle is the last part in the chain and decides how the stream leaves the tool.

A trigger or dial controls how fast the motor runs.

How does the fan move air through the blower?

The fan is a set of blades around a hub, and when it spins it pulls air in at the center and throws it outward. That outward throw is what builds pressure inside the housing.

Think of a paddle wheel in water: the faster it turns, the harder it flings material to the edge. A leaf blower fan works the same way, except the material is air.

The curved housing collects that fast-moving ring of air and funnels it into the outlet. Because the air is already moving when it reaches the outlet, the nozzle only has to speed it up and point it.

A turbine fan moves a wide stream of air rather than a narrow one. The EGO LB7654 uses turbine fan engineering to produce up to 765 CFM in turbo mode and up to 200 MPH of air speed.

Why does the nozzle make the air come out faster?

The nozzle speeds the air up because it narrows the path the air has to travel. The same amount of air has to pass through a smaller opening, so it leaves faster than it entered.

A garden hose shows the same effect when you put your thumb over the end. A tapered nozzle focuses the stream and increases speed, which helps push stuck leaves and heavier debris.

A spread nozzle widens the outlet, so the air moves over more ground at lower speed. The EGO LB7654 includes a tapered nozzle and a spread nozzle so you can swap them for the job.

That is why a blower with modest airflow can still move a leaf well: the nozzle turns volume into speed at the tip. For the volume side of that trade, our guide to what is a good CFM for a leaf blower breaks the numbers down.

What is the difference between CFM and MPH?

CFM measures how much air moves, and MPH measures how fast it moves. CFM stands for cubic feet per minute, the volume the fan pushes past a point in a minute.

MPH stands for miles per hour, the speed of the air leaving the nozzle. High CFM clears a wide area quickly, so it suits driveways, patios and open lawns.

High MPH pushes harder against a single spot, so it helps loosen wet leaves and matted piles. A wide nozzle with big airflow favors CFM; a narrow nozzle favors speed.

A tool rated at 350 CFM and 210 MPH moves a narrower, faster stream than one rated at 600 CFM and 110 MPH. Both can clear a lawn, but they feel different in your hands.

How does a gas leaf blower work?

A gas leaf blower uses a small engine to turn the fan, and the engine burns fuel to make that turning force. Fuel and air mix in the carburetor, enter the cylinder, and the spark plug ignites the mix.

The small explosion pushes the piston down, and that motion turns the crankshaft. The crankshaft connects to the fan, so the fan spins and moves air exactly as it does on an electric model.

Gas blowers can run for as long as the fuel lasts, which suits large properties. The trade-offs are weight, noise, exhaust fumes and regular engine upkeep.

The engine only changes how the fan gets its power.

How does an electric or corded leaf blower work?

A corded leaf blower uses a mains-powered electric motor to spin the fan, so it runs as long as it stays plugged in. There is no fuel tank and no pull start.

You press a trigger or flip a switch and the motor turns the fan. A corded model delivers steady power with no battery to recharge and no fumes.

The catch is the cord, which limits how far you can walk from the outlet and can snag on shrubs. The WORX WG520 is a corded 12 Amp model rated at up to 600 CFM and 110 MPH.

Its turbine fan moves a wide stream of air across lawns, driveways and decks. A variable speed control lets you run lower airflow for light sweeping or higher airflow for bigger piles.

If you are new to the controls, our guide on how to turn on a leaf blower covers the switch, trigger and speed dial.

How does a battery leaf blower work?

A battery leaf blower runs its motor from a rechargeable lithium-ion pack, so the fan spins without a cord or fuel. The pack sends power to a motor controller, which sets the motor speed.

A brushless motor uses less energy and lasts longer than a brushed one, which is why many cordless models use it. The EGO LB7654 pairs a high-efficiency brushless motor with a 56V ARC Lithium battery.

Its variable speed cruise control dial adjusts airflow from 260 to 580 CFM, and turbo mode reaches 765 CFM and 200 MPH. EGO says a single charge of the included 5.0Ah battery lasts up to 90 minutes, and the battery charges in 70 minutes with the included charger.

The cost of going cordless is runtime: the fan stops when the charge runs out.

What makes one blower stronger than another?

A stronger leaf blower moves more air faster, and that comes from three things: motor power, fan design and nozzle shape. A more powerful motor spins the fan faster and keeps it spinning under load.

A well-shaped fan and housing move air with less waste. A tapered nozzle turns that airflow into a faster stream at the tip.

Turbo sends more power to the motor so the fan spins faster than its normal setting. The EGO LB7654 uses turbo mode to push through wet leaves and caked grass.

The WORX Trivac WG509 takes a different route: it is a 3-in-1 tool that blows at up to 350 CFM and 210 MPH and also vacuums and mulches leaves. Its vacuum mode pulls debris into a 42L collection bag, and its metal impeller shreds leaves at an 18:1 mulch ratio.

How do you use the airflow to clear a yard?

Point the nozzle down and slightly forward, and work with the wind rather than against it. Start at the far edge of the area and push leaves toward one pile or the edge of the lawn.

Use a sweeping motion rather than jabbing at individual leaves. A wide nozzle and higher CFM suit open hard surfaces like driveways and patios.

A tapered nozzle and higher speed suit stuck leaves along fences and lawn edges. Lower the speed near garden beds, mulch and young plants so you don't blow soil or expose roots.

Keep the nozzle a few inches above the ground so the stream can do its work. On a long job, a lighter tool matters as much as airflow, and our guide to how much does a leaf blower weigh helps you compare.

Noise is the other practical factor; see how loud is a leaf blower before you pick a time to work.

Which type of leaf blower fits your yard?

Pick a corded blower for steady power and no charging if your outlets reach the whole yard. Pick a cordless blower if you need to move freely across a large property.

Pick a 3-in-1 tool if you would rather collect and shred leaves than blow them into a pile. For most yards with nearby outlets, the corded WORX WG520 covers the basics with up to 600 CFM and a light 6.4 lb body.

For a bigger property, the EGO LB7654 gives you up to 765 CFM in turbo mode and up to 90 minutes from the included battery. For fall leaf piles you want to bag, the WORX Trivac WG509 blows, vacuums and mulches in one pass.

That is how a leaf blower works in practice: the motor spins the fan, the housing and nozzle shape the stream, and your job decides which tool you want in your hands. If you still need to compare airflow numbers, read what is a good CFM for a leaf blower next.

Frequently asked questions

How does a leaf blower move leaves?

The fan pushes a fast stream of air out of the nozzle. That moving air hits the leaf and transfers its motion to it, lifting and sliding it along the ground and hard surfaces.

What is CFM on a leaf blower?

CFM means cubic feet per minute, the volume of air the blower moves. A higher CFM clears wider areas faster, while air speed in MPH decides how well the stream pushes heavier or wet debris.

Does a wider nozzle make a leaf blower stronger?

A narrower nozzle speeds the air up and focuses it, which helps move stuck leaves. A wider nozzle spreads the airflow over more ground, so it clears open areas faster but with less push per inch.

Why do cordless leaf blowers have a turbo mode?

Turbo mode sends more power to the motor so the fan spins faster and moves more air. It clears wet leaves and heavier debris but uses battery charge faster than the normal speed settings.

Can a leaf blower damage plants or lawns?

A strong stream aimed directly at soil, mulch or young plants can move material and expose roots. Keep the nozzle pointed at hard surfaces and loose leaves, and use lower speeds near garden beds.