What Is Airflow in Industrial Vacuums? Decoding m³/h and L/min

Updated On: Parameter Description

Open any industrial vacuum catalog, and you will always see one line: Airflow (m³/h). Some machines show 268. Some show 1450. Some dust collectors show 23500. What does this number mean? And what changes when the number gets bigger? This post explains it in simple words, with real data from the ENDUSTMAN catalog.

What Is Airflow?

Airflow = the volume of air a vacuum sucks in per unit of time.

Simple words: how much air (with dust inside) the machine can move every hour.

Think about breathing. When you breathe fast, you move more air. An industrial vacuum is the same. The airflow number tells you how much dust-laden air goes through the hose in one hour.

Airflow does not tell you “how strong” the machine is. That is another parameter — Suction (kPa). Airflow tells you how much the machine can carry away. We will talk about this difference in Section 3.

Two Units: m³/h and L/min

In the ENDUSTMAN catalog, most electric models use m³/h (cubic meters per hour). But the pneumatic (air-powered) models use L/min (liters per minute). For example, the pneumatic models ERTS30 and ERTD70 both show 4360 L/min.

These two units measure the same thing. You can convert them with one simple formula:

m³/h = L/min × 60 ÷ 1000

Example: 4360 L/min × 60 ÷ 1000 ≈ 261.6 m³/h

So the ERTS30 and ERTD70, at 4360 L/min, move about 261.6 m³ of air per hour. That is close to the small 220V electric models.

💡 Pro Tip

Before you compare two machines, always convert the airflow to the same unit. 4360 L/min looks like a huge number, but it is only about 261.6 m³/h. Same machine, same power — just a different unit.

Airflow Decides “How Much”, Suction Decides “How Hard”

Many buyers mix up airflow and suction. They are two different things:

  • Suction (kPa) = the force. It answers: “Can this machine lift the dust?” Heavy things like metal chips and stones need high suction.
  • Airflow (m³/h) = the volume. It answers: “How much dust can this machine carry away per hour?” Big areas and light dust need high airflow.

A simple picture: suction is how hard you suck a drink through a straw. Airflow is how much drink passes through the straw every minute. For cleaning a big factory floor with light dust, you want a “big straw” — high airflow. For picking up steel grit or stones, you want a “strong mouth” — high suction. In most cases, when one goes up, the other goes down. Good machine design balances both.

Real Numbers from the ENDUSTMAN Catalog

Now let’s look at real models. The table below shows airflow numbers from small to big, and what each level is good for.

Model

Series

Power

Airflow

Best For

EATD12C

220V Cleanroom Vacuum

1200 W

268 m³/h

Cleanrooms, food & pharma, fine dust

EATD24

220V Split-Tank Vacuum

2400 W

320 m³/h

Factory floor dust, cement, flour

EHTD40

380V Compact Split-Tank

4000 W

410 m³/h

Metal chips, glass, sand; continuous work

EHFD75

380V Heavy-Duty Vacuum

7500 W

540 m³/h

Steel grit, stones, heavy debris

EHFD250

380V Heavy-Duty Vacuum

25 kW

1450 m³/h

Large factories, very heavy dust load

ECH22M

Large Dust Collector

22 kW

12800–23500 m³/h

Whole production lines, many suction points

Look at the gap. From 268 m³/h (EATD12C) to 1450 m³/h (EHFD250), the airflow is more than 5 times bigger. And the ECH22M dust collector, at up to 23500 m³/h, is about 88 times the EATD12C. These are not “better” or “worse” machines. They are machines for completely different jobs: one cleans a cleanroom corner, the other serves a whole production line.

Bigger Airflow Is Not Always Better

High airflow is great for light dust over big areas — flour, cement powder, carbon powder on a large workshop floor. But big airflow has a price:

  • More power. The ECH22M needs 22 kW. The EATD12C needs only 1200 W. Your power bill follows the airflow.
  • More noise. The EATD24 runs at 64 dB(A). The ECH22M runs at 84–88 dB(A). Your workers will hear the difference.
  • Bigger body. High-airflow machines are larger, heavier, and need more space.

⚠️ Do Not Over-Buy: A 23500 m³/h dust collector for one small workshop is like using a fire hose to water flowers. You pay more for the machine, more for electricity, and get more noise — for dust that a 320 m³/h machine could handle. Match the airflow to the real job.

How to Choose: Match Airflow to Your Job

Use this simple guide when you read the airflow number in the catalog:

  • Light dust over a big area (flour, cement, carbon powder) → choose higher airflow first.
  • Heavy debris (metal chips, glass, steel grit, stones) → check Suction (kPa) first, airflow second.
  • One workstation or a small workshop → 268–410 m³/h is usually enough (EATD12C, EATD24, EHTD40).
  • Big factory with heavy daily dust → look at 1000 m³/h and above (EHFD110 at 1050 m³/h, EHFD250 at 1450 m³/h).
  • A whole production line with many suction points → a dust collector like the ECH22M, 12800–23500 m³/h.
  • No power outlet on site → battery models still give you 342–530 m³/h (EEFD10P, EEFD15P).

💡 Pro Tip

Airflow drops when the filter gets dirty. A machine with a bigger filter area keeps its airflow stable for longer — that means less cleaning stops and more real work done. We will explain Filter Area (cm²) in another post of this series.

In Short

Airflow is the volume of air a vacuum moves per hour. It decides how much dust you can carry away and how fast you can clean a big area. Convert m³/h and L/min before you compare. And remember: the right number is better than the biggest number.

See the Full ENDUSTMAN Catalog

All models with airflow, suction, and full parameter tables – find the right machine for your job.

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