Enhancing indoor air quality

Condensation, dampness, mould and poor indoor air quality (IAQ) are common year-round issues in homes, often stemming from inadequate ventilation. Electrical professionals can help tackle these issues by installing advanced IAQ technologies and guiding customers on the long-term benefits of these solutions, says Lee Stones, Senior Category Manager – Ventilation at Xpelair by Dimplex. Here, Lee explores the importance of maintaining optimal IAQ and showcases positive input ventilation (PIV) systems as an effective solution for creating healthier living spaces.

Indoor air quality (IAQ) is a growing concern, particularly as airtight building designs become more common. Public Health England warns that poor IAQ can contribute to respiratory infections, heart disease and even lung cancer. A BEAMA survey found that 65% of UK homes experience indoor air pollution, with indoor air containing up to 50 times more pollutants than outdoor air. Mould is another widespread issue, with data from the Warm This Winter campaign revealing that 29% of UK residents frequently or occasionally experience mould in their homes. The COVID-19 pandemic further underscores the need for adequate ventilation systems to reduce airborne pathogen transmission.

Maintaining clean air has never been more critical, as people spend most of their time indoors. As such, the industry continues to develop energy-efficient ventilation systems that enhance IAQ, focusing on energy-efficient and environmentally sustainable solutions which also operate quietly.

PIV systems

One high-performance solution is positive input ventilation (PIV). These systems provide controlled, efficient mechanical ventilation to reduce excess humidity, which is a primary cause of condensation and mould growth, without compromising a property’s energy efficiency.

PIV systems are straightforward to install in most properties. They draw in fresh external air, filter pollutants and allergens, and introduce clean air into the home through a ceiling diffuser. This creates a gentle, positive air pressure that pushes stale, moist air out through natural escape points such as trickle vents and door gaps, reducing humidity levels and improving air quality.

Many PIV units include heating elements to temper incoming air during colder months, ensuring comfort year-round. They operate automatically with minimal user interaction, are designed to be low-maintenance, and offer a ‘set and forget’ solution. Their quiet operation and unobtrusive design make them a seamless addition to homes, and with low power consumption, they provide an energy-efficient approach to tackling IAQ challenges.

Healthier indoor environments

A leading solution is Xpelair’s Everdri, a PIV system designed for houses with loft spaces. Installed centrally on the landing or in a hallway, the Everdri transforms stale, stagnant air into a fresh, healthy, condensation-free environment.

The Everdri PIV unit reduces surface condensation and mould, improving overall air quality. It also significantly lowers radon levels by gently introducing fresh, filtered air and expelling contaminated air. Everdri redistributes warmer air from ceiling level, which can be up to 7˚C higher than ground level, potentially reducing heating costs. For ease of use and maintenance, it includes an easily replaceable, long-lasting, washable G4 filter to capture dust, pollen and other airborne particles.

The Everdri XELH model offers extra features to ensure comfortable temperatures and prevent cold draughts during colder months. These include a pre-heater that tempers the incoming air and a temperature probe that monitors air conditions. This enables the system to adjust airflow for optimal energy efficiency.

Embracing high-performance ventilation systems improves living conditions and supports healthier, more energy-efficient buildings, contributing to a more sustainable future. By offering PIV systems, installers can deliver a modern solution that meets growing demands for healthier, energy-efficient indoor environments while creating a professional point of difference and expertise in a competitive market.

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This article appeared in Electrotechnical News May/June 2025 edition – read it here