64 dB vs 88 dB: Reading the Noise Level Spec

Updated On: Parameter Description

Buyers look at power, suction, airflow — and skip the Noise Level line. Then the machine arrives, gets switched on, and the whole workshop looks up. In the ENDUSTMAN catalog, noise runs from 64 dB(A) to 88 dB(A). That gap is much bigger than it looks. This post shows you how to read it.

What Does dB(A) Mean?

dB(A) = decibels with “A-weighting” — loudness measured the way human ears hear it.

The “(A)” filter copies your ear: it counts the frequencies people are most sensitive to, and discounts very low and very high sounds.

That is why the unit is written dB(A) and not just dB. A machine and a test instrument may “hear” sound differently — A-weighting makes the number match what your workers will actually experience on the floor. When you compare machines, always compare dB(A) with dB(A).

The Trap: Decibels Are Not Linear

Here is the most important thing about this spec. Decibels work on a logarithmic scale — the numbers do not grow the way normal numbers do.

+10 dB ≈ sounds about TWICE as loud to the human ear.

So 74 dB sounds twice as loud as 64 dB. And 84 dB sounds about FOUR times as loud as 64 dB.

Now look at the catalog range again: 64 dB(A) to 88 dB(A). On paper it is “only” 24 points. To the ear, the loudest machine in the catalog sounds roughly 5 times louder than the quietest one. That is the difference between “you can talk next to it” and “you must shout”.

From 64 to 88: Real Numbers from the Catalog

Model

Series

Power

Noise Level

What It Feels Like

EATD24

220V Split-Tank Vacuum

2400 W

64 dB(A)

Close to normal conversation

EHFD22

380V Heavy-Duty Vacuum

2200 W

64 dB(A)

Close to normal conversation

EHTS30C

380V Cleanroom Vacuum

3000 W

70 dB(A)

Clearly audible, still comfortable

EHFD75

380V Heavy-Duty Vacuum

7500 W

72 dB(A)

Loud talk needed nearby

EHFD250

380V Heavy-Duty Vacuum

25 kW

80 dB(A)

Shouting distance conversation

ECH22M

Large Dust Collector

22 kW

84–88 dB(A)

Hearing protection territory

More Power, More Noise — and What Fights Back

Read the table again and you will see the rule: noise follows power. Inside the same heavy-duty EHFD family, the ladder is very clean: 2200 W → 64 dB, 4000 W → 69 dB, 7500 W → 72 dB, 25 kW → 80 dB. A stronger motor moves more air, and moving air makes noise. This is physics, not a defect.

But design can fight back. Three examples from the catalog:

  • Silencer as standard. The EHFD-M pulse series ships with a silencer included (plus a vacuum gauge and phase-reversal switch). The exhaust is where much of the noise escapes — a silencer cuts it at the source.
  • Motorless pneumatic models. The ERTS30 and ERTD70 have no electric motor at all — they run on compressed air and the catalog lists them as “motorless, low-noise” machines at 72–75 dB(A) for explosive environments.
  • Low-noise cleanroom design. The EHTS-C series lists “low-noise, compact & convenient” as a feature, with noise at 65–70 dB(A) — built for food, pharma, and chemical plants where people work close to the machine all day.

💡 Pro Tip

Catalog noise is measured under standard test conditions. Your real workshop changes the result: hard concrete walls reflect sound and make it feel louder; a machine placed in a corner or behind a wall sounds much quieter at the workstation. Placement is a free noise reducer.

Workshop Noise Rules: The Numbers to Remember

Noise is not only comfort — in many countries it is a regulated safety item. While exact rules differ by country, these reference values are widely used:

  • 85 dB(A) for 8 hours — the classic occupational exposure limit. Many regulations (for example China’s GBZ workplace standard and the US OSHA action level) use 85 dB(A) as the line where employers must act: noise monitoring, hearing protection, reduced exposure time.
  • Above 85 dB(A) — hearing protection (earplugs or earmuffs) is normally required for anyone working close to the source for long periods.
  • Every +3 dB doubles the sound energy — so exposure time allowed at 88 dB is roughly half of that at 85 dB.

⚠️ Plan Before You Buy: A big dust collector like the ECH22M runs at 84–88 dB(A). That is a fine number for a machine that serves a whole production line — but do not place it in the middle of your workstations without a plan. Give it its own corner, a barrier, or a machine room, and your 88 dB problem at the source becomes a comfortable level at the worker’s ear.

Noise-Sensitive Workshop? Your Options

  • Offices nearby, food/pharma floors, workers always close to the machine → choose the quiet end: 64 dB(A) models like the EATD24 or EHFD22, or the low-noise cleanroom EHTS-C series at 65–70 dB(A).
  • Need strong power but hate the noise → look at models with a silencer included (EHFD-M series), or the pneumatic motorless ERTS30 / ERTD70 if you have compressed air on site.
  • Heavy-duty or collector-class machines (80+ dB) → accept the noise at the source, control it at the ear: separate machine area, barriers, and hearing protection for anyone working long hours nearby.
  • Cleaning while others work → run quieter battery or 220V models during shifts, and schedule the loud heavy cleaning for off-hours.

In Short

Noise Level in dB(A) tells you loudness the way ears hear it — and because decibels are logarithmic, every +10 dB sounds about twice as loud. The catalog runs from a conversation-quiet 64 dB(A) (EATD24, EHFD22) to 84–88 dB(A) on big collectors (ECH22M). Noise follows power, but silencers, motorless pneumatic designs, and smart placement keep it under control. Check the 85 dB(A) line against your local rules, and pick the noise level that matches where the machine will actually work.

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