Mechanical Ventilation with Heat Recovery

WAVIN EXPANDS MVHR PORTFOLIO WITH LAUNCH OF FLEXPRO-90

Building Products Index Ltd April 29, 2026 Pipes, Plastic piping Leave a Comment

Leading plumbing and drainage manufacturer Wavin expands its Mechanical Ventilation Heat Recovery solutions with the launch of the new Ventiza FlexPro-90, a higher-capacity semi-rigid radial duct developed to meet the increased airflow demands of modern, energy-efficient homes.

The new 90mm duct builds on the Ventiza FlexPro‑75 system introduced last year, delivering up to 45% more airflow than standard 75mm options at the same velocity levels – enabling installers to achieve required ventilation rates using fewer ducts.

The increased airflow capacity lowers the back pressure and enables MVHR units to operate at lower speeds, helping to reduce energy consumption and lower system noise for homeowners.

Supplied in continuous 50‑metre coils, the new semi-rigid radial duct reduces the number of joints required, supporting simpler installation and minimising air leakage risk.

The duct’s double‑wall construction includes an insulating air void to support improved acoustic and thermal performance, contributing to quieter operation within the home. The material also incorporates antibacterial, antifungal, and antistatic properties to help maintain air‑quality standards and reduce dust build‑up inside the system over time.

Features of the Ventiza FlexPro range include a smooth internal surface designed to reduce air resistance, and a ribbed exterior providing high mechanical strength and impact resistance suitable for on‑site conditions.

FlexPro‑90 is available now, with a full range of connectors to be introduced in May. The duct has been designed to remain compatible with existing connectors on the market, so ongoing projects can adopt the new system without delay.

Ben Perris Sales Director for Indoor Climate Solutions for Wavin said: “The launch of FlexPro‑90 is a great example of our commitment to giving installers and developers the flexibility they need to design high‑performing, future‑ready ventilation systems in action. Its increased airflow capacity supports the growing demands of modern, energy‑efficient homes, while helping installers create simpler, more efficient systems with less noise and lower energy use.”

Alongside the new Ventiza FlexPro range, Wavin’s online Ventilation System Finder supports early‑stage project design by helping built environment professionals identify the correct ducting configuration and suitable MVHR unit for their specification.

Following system selection, Wavin’s technical team works directly with developers and installers throughout design and installation, helping to ensure accurate system performance and smoother project delivery.

For more information on Ventiza Flex-90 visit:

https://wavin.com/gb/p/f30f000a-99c7-459a-b41e-85e19a8c3118/ventilation-pipe-ventiza-flexpro-75

Understand how MVHR can improve quality of life and save money in social housing settings

Building Products Index Ltd January 24, 2017 Fan, Ventilation Leave a Comment

View the Airflow entry on BPi

Visit the Airflow website

Low income families are typically more affected by air pollution with children most at risk. The UK currently has over 40,000 deaths a year linked to poor air quality costs the economy billions a year. With indoor air pollution often 50% worse than outdoors and can contain up to 900 different pollutants it is imperative that a suitable system is installed to improve the health of the occupants as well as protecting the fabric of the home itself.

Mechanical Ventilation with Heat Recovery (MVHR) is the process of continually preheating filtered, incoming fresh air from outside by warming it with the outgoing waste air which is created by kitchens, bathrooms, utility rooms etc. Once the warmth is transferred, the now warm, clean air is the supplied to the living areas such as living rooms and bedrooms.

The following example will show the cost benefit of having a MVHR system installed in the property. This example assumes that both properties are 300m² in size.

House A	House B
Uses extract and trickle vents to ventilate the property. It has 2 air changes an hour and uses gas heating to warm the property	Uses an MVHR unit with 71%* heat recovery. It has an air change rate of 320m³/hr (89 l/sec), assuming no infiltration and uses gas heating to warm the property
Heat loss from infiltration at 2 ach 14,164 kWh per year at a cost of £0.0359 per kWh = £508.49 per year	Heat loss due to ventilation at 320m³/hr at 7677kWh with 71% thermal efficiency = 2226 kWh. With a cost of £0.0359 per kWh = £79.92 per year
Cost of running a bathroom and kitchen fan operating at 1 hour per day at 0.05kW = £2.08 per year	MVHR with two fans running, operating 24 hours a day at 693 kWh = £104.70 per year
Total ventilation energy cost = £510.57 per year	Total ventilation energy cost = £184.62 per year

Additional saving with 80% thermal efficiency = £16.54

Additional saving with 90% thermal efficiency = £34.90

All new Airflow domestic MVHR units have a thermal efficiency of 90% or greater so you stand to see up to a £355 per year reduction in your energy bills.**

^{*Domestic Building Services Compliance Guide Section 8 specifies a minimum thermal efficiency of 70%}

^{**assuming a kWh price of £0.0359}

An ideal MVHR system to be used in social housing settings is the Adroit

Airflow Adroit MVHR units can be set up during the commissioning process to limit the tenants’ access to the control system. This removes the issue of tenants changing the ventilation rates for the property as well as them switching the unit off, guaranteeing effective ventilation always takes place within the property; protecting the health of both property and tenants. Your tenants, however, will still be able to tailor their ventilation around their daily routine through selecting the relevant ventilation profile to suit their needs.

As landlords, you would be able to remotely monitor the performance of the unit and be notified of when maintenance, such as changing the air filters, is required and in turn prolong the lifecycle of your Adroit unit.

Furthermore, in our Adroit DV50 and DV80 models, you can have these installed above the entrance to the property, so maintenance can be undertaken to the unit without disturbing the tenant.

You can learn more about the benefits MVHR brings to social housing developments in this short video: https://www.youtube.com/watch?v=d8fMprlKHos