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Stork Air HRU units

Stork Air HRU unit repair and overhaul

Stork Air HRU units such as the WTW 5, 6, 7, 10, 11, 12, WHR 90 and WHR 91 are still in use in many homes. Is the unit noisy, is the motor running heavily, or is the ventilation less effective? Then motor overhaul is often a good and sustainable solution.

Product group HRU units
  • WTW 5, 6, 7, 10, 11 and 12
  • WHR 90 and WHR 91
  • Motor overhaul often possible
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Known Stork HRU models

  • Stork WTW 5, 6 and 7: early balanced ventilation systems.
  • Stork WTW 10 and 11: large metal HRU units from the 90s.
  • Stork WTW 12: further development of the WTW 11.
  • Stork WHR 90 and WHR 91: widely used HRU units in Dutch homes.

Common problems

  • The HRU unit is noisy or humming.
  • The motor no longer runs or runs heavily.
  • The extraction or supply has decreased.
  • The bearings or motor parts are worn out.
  • The unit vibrates or makes a grinding sound.

Motor overhaul of Stork HRU units

For many Stork Air HRU units, it is not necessary to replace the complete unit. When the motor, bearings, or rotating parts are worn, an overhaul can be an economical and sustainable alternative.

Don't know which HRU unit you have?

Check the unit's type plate or send us a photo via WhatsApp. We will gladly help you find the right overhaul or repair for your Stork Air HRU unit.

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Overhaul or replace?

Older Stork HRU units are often solidly built. If mainly the motor or bearings show wear, an overhaul can extend the lifespan without having to replace the entire installation.

Choose the right solution

HRU motor overhaul View repairs → Back to Stork Air View all Stork Air information →

Read more about Stork Air

Also check out our other information pages about Stork Air ventilation units, HRU units, parts, malfunctions and overhaul.

Stork Air ventilation units Main page of the Stork Air knowledge center Mechanical ventilation units CM, CMA, CME, CML, CMLe, CMF and CMFe HRU units WTW 5 to 12, WHR 90 and WHR 91 Roof and pipe ventilators CDA, DAM, DAP, RAD and VDA Stork Air overhaul Motor overhaul and repair of Stork Air systems Stork Air parts Motors, circuit boards, capacitors and other parts Stork Air is noisy Noise, vibrations and wear Stork Air hums Constant hum or resonance Stork Air no longer runs Motor does not start or does not respond Stork Air does not extract properly Low extraction or moisture problems Stork Air bearings worn Grinding or squealing motor due to wear

Is your problem or model not listed?

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