You can't see air, but you'll know if it's not working effectively inside your home.
Skipping the design phase for your MVHR (Mechanical Ventilation with Heat Recovery) system and relying on guesswork or a "one-size-fits-all" approach can lead to significant problems. Every MVHR system is different, and with airflow caluclations, resistance, noise and many other considerations in play, working wih a specialist is essential to a quiet running efficient system.
Here are the three main issues you might face:
1. Poor Airflow Distribution
Without a proper design, the airflow within your home is unlikely to be balanced. This can result in some rooms being over ventilated (causing heat loss/drafts) and others under ventilated (leading to stale air and condensation). Achieving the correct balance requires precise airflow calculations and careful consideration of your home’s layout, including room sizes, ceiling heights, and door placements.
For New Build projects, airflow calculations are essential for regualtory requirements and Building Control Sign off. For MVHR Retrofit, following the airflow requirements for the home is recommended for optimum installed performance.
What's the point of of investing in a system that conrols air, if it isn't up to the job?
The impact
- Uneven temperatures and comfort levels
- Reduced air quality in critical areas like bedrooms or living spaces
- Potential for increased humidity and mould growth in poorly ventilated areas
2. Inefficient Energy Performance
One of the key benefits of an MVHR system is energy efficiency, but this is heavily reliant on accurate design. Without proper planning, ductwork may causes excessive resistance as a result of too many bends or not following optimal routes - all reducing the MVHR system’s installed performance and usually resulting in the system having to be run at a higher rate to compensate, Additionally, a poorly designed system may result in heat recovery rates far below their potential.
The impact
- Higher energy bills due to inefficient operation
- A system that fails to meet building regulation standards for efficiency
- Increased carbon footprint, counteracting the environmental benefits of MVHR
3. Excessive Noise and Discomfort
Size matters when it comes to a MVHR unit and how it performs with the ducting. Floor Area's are usually recommended, but it comes down to how much ducting as to whether the unit can actually perform - and perform quietly! An MVHR system that hasn’t been designed properly often leads to noisy operation. Incorrect duct sizing, improper placement of supply and extract points, or inadequate soundproofing can amplify the sound of moving air and the unit’s mechanical operation. This is particularly disruptive in bedrooms and living spaces where quiet operation is crucial.
The impact
- Annoying noise that affects your quality of life
- Potential for system adjustments or costly retrofits to mitigate noise
- Dissatisfaction with the system despite its intended benefits
Why Professional Design Matters
A well designed MVHR system ensures optimal performance, comfort, and energy efficiency, tailored specifically to your home. It eliminates common issues by
- Accurately calculating airflow rates for each room and the entire house
- Minimising energy losses with efficient duct routing and duct type
- Ensuring quiet operation when running - the absolute number 1 need!
Find out more about MVHR Design Service and our Free MVHR Proposal
How about a MVHR Illustration in 60 Seconds?
