How to choose suitable vibration isolators for ventilation ducts?

The characteristics:

  • Weight: very light – light – heavy
  • Disturbing frequency: low – medium – high
  • Mounting: hanging

Find below our tables of Damping efficiency upon disturbing frequency

vibration isolators for ventilation ducts

Walraven VibraTek® selection matrix:

How to evaluate the suitability of an isolator?

walraven vibratek how to redt the tables

How to read the tables?

Example: the load per one vibro-isolator is 280 kg, and the operating frequency of the device is 2300 rpm. See the 5 steps to read from the table (as shown in the attached diagram) to find out if the selected vibro-isolator meets the damping conditions and is well-matched.

The motor’s speed (rpm) causes vibrations (Hz) in HVAC devices. To simplify product selection, we’ve organized tables by speed, as it’s easily obtainable from suppliers.

  1. Select the weight of the device in the table – greater than or equal to 280 kg
  2. Horizontally to the left, you can see the product number of Walraven VibraTek®
  3. Horizontally to the right, you can read the deflection
  4. Locate the column with a frequency lower than 2300 rpm
  5. Read the damping performance at: cross-deflection and frequency

Damping efficiency upon disturbing frequency

Damping performance description

 

V[%] Damping performance description
99% excellent high requirements medium requirements regular requirements
93% perfect
88% very good
81% good
67% sufficient
20% mediocre low improvement or negative impact – contact Walraven Technical Support for alternative solution
0% nochange
resonance better without insulation

Walraven VibraTek® HS-1

Walraven VibraTek® HS-1 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800600050 25 2,5 11,5 54,6% 86,1% 91,5% 94,3% 96,4% 98,0% 98,7%
50 5 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800600150 100 10 15,3 69,4% 89,9% 93,8% 95,8% 97,3% 98,5% 99,1%
150 15 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800600250 200 20 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
250 25 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800600500 300 30 13,8 64,8% 88,7% 93,0% 95,3% 97,0% 98,3% 98,9%
400 40 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
500 50 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800600750 600 60 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
750 75 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800601000 800 80 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
900 90 20,7 79,0% 92,7% 95,5% 96,9% 98,0% 98,9% 99,3%
1000 100 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%

Walraven VibraTek® HS-1X

Walraven VibraTek® HS-1X Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800701000 800 80 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
1000 100 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800701250 1100 110 20,2 78,4% 92,6% 95,4% 96,8% 98,0% 98,9% 99,3%
1250 125 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800701500 1400 140 21,5 79,9% 93,0% 95,6% 97,0% 98,1% 98,9% 99,3%
1500 150 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800702000 1750 175 18,3 75,6% 91,7% 94,8% 96,5% 97,8% 98,8% 99,2%
2000 200 20,9 79,3% 92,8% 95,5% 96,9% 98,1% 98,9% 99,3%
2200 220 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800703000 2600 260 19,9 78,0% 92,4% 95,3% 96,8% 98,0% 98,9% 99,3%
3000 300 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800704000 3250 325 18,7 76,2% 91,9% 95,0% 96,5% 97,8% 98,8% 99,2%
3750 375 21,6 80,0% 93,0% 95,7% 97,0% 98,1% 98,9% 99,3%
4000 400 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800705000 5250 525 24,2 82,5% 93,8% 96,1% 97,4% 98,3% 99,1% 99,4%
5750 575 26,5 84,3% 94,4% 96,5% 97,6% 98,5% 99,1% 99,5%
5000 500 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800706000 5250 525 20,1 78,3% 92,5% 95,3% 96,8% 98,0% 98,9% 99,3%
5750 575 22,0 80,5% 93,2% 95,8% 97,1% 98,2% 99,0% 99,3%
6000 600 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%

Walraven VibraTek® HR-1

Walraven VibraTek® HR-1 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800800300 200 20 2,3 385,6% -50,7% 37,5% 63,5% 79,4% 89,4% 93,4%
250 25 2,9 633,0% 7,4% 55,5% 72,8% 84,2% 91,7% 94,8%
300 30 3,5 4077,4% 33,1% 65,5% 78,3% 87,1% 93,1% 95,7%
2800800450 350 35 3,1 849,3% 17,9% 59,5% 74,9% 85,3% 92,2% 95,2%
400 40 3,6 10443,2% 34,9% 66,2% 78,7% 87,4% 93,3% 95,8%
450 45 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%

Walraven VibraTek® SA-3

Walraven VibraTek® SA-3 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800800300 200 20 2,3 385,6% -50,7% 37,5% 63,5% 79,4% 89,4% 93,4%
250 25 2,9 633,0% 7,4% 55,5% 72,8% 84,2% 91,7% 94,8%
300 30 3,5 4077,4% 33,1% 65,5% 78,3% 87,1% 93,1% 95,7%
2800800450 350 35 3,1 849,3% 17,9% 59,5% 74,9% 85,3% 92,2% 95,2%
400 40 3,6 10443,2% 34,9% 66,2% 78,7% 87,4% 93,3% 95,8%
450 45 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%

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