Frequently Asked Questions

MVHR stands for Mechanical Ventilation with Heat Recovery. It’s a smart ventilation system that continuously extracts stale, moist air (from kitchens, bathrooms, etc.) and supplies fresh, filtered air to living zones like bedrooms and lounges. The key efficiency lies in its heat exchanger, which transfers up to around 95 % of the heat from outgoing air to the incoming air—thus reducing energy waste.

The MVHR system should be designed into your project as early as possible! It is really hard to add an MVHR system into a low energy or Passivhaus building design later on in the process. We can work with your Architect or building designer will work closely to overcome any possible issues and make sure the system is designed to work optimally.

Yes you can and the MVHR system will continue to operate in the background.

• Every 6–12 months: Replace or clean filters.

• Every 5–6 years: Arrange a professional service to clean the heat exchanger, fans, and ducting.

  These tasks ensure the system remains efficient and hygienic.

• Holiday mode: You can reduce fan speed to conserve energy, then revert when you return.

• High occupancy (like parties): Use the ‘boost’ or high-ventilation setting. Once the situation passes, switch back to normal.

Yes—by balancing humidity levels and providing continuous fresh air, MVHR systems significantly reduce condensation and help prevent mould formation.

When correctly sized and installed, MVHR systems operate quietly—usually not exceeding 50 % of fan capacity in normal mode—so noise isn’t typically a concern.

• Locate the unit within the thermal envelope

• Ensure easy access for maintenance tasks.

• Look for well-designed heat exchangers and high-quality filters to maximise efficiency and air quality

Yes, though it requires careful planning. While new builds allow easier duct routing, retrofitting—especially in older properties—can be more complex and costly due to structural constraints. Ceiling installations with insulation to the ducts, compact units, and duct concealment behind bulkheads and dropped ceilings are common strategies to minimise disruption.