We find out how Aico is improving fire detection systems in ventilated homes.

Flagship Housing is a UK social housing provider, managing over 33,000 homes across the East of England. The organisation not only builds, lets, maintains and improves homes for rent and sale, but also reinvests profits to fund more affordable housing and community-focused services.

Objectives and safety priorities

Positive Input Ventilation (PIV) and Mechanical Ventilation with Heat Recovery (MVHR) systems are increasingly used within social housing to improve indoor air quality and address damp and mould. While these systems deliver clear health benefits, they also introduce important fire‑safety considerations, particularly around ductwork, compartment penetrations, and the potential for smoke movement within a dwelling.

Since Davin Gee joined Flagship Housing three years ago as Compliance Manager (Electrical), Aico has worked closely with him to develop a robust, standards‑led solution that improves resident safety while providing meaningful compliance assurance.

The project was designed to achieve two primary objectives:

• Improve resident safety in properties fitted with PIV or MVHR systems
• Provide live compliance data and remote notification of fire alarm activations

A key requirement was ensuring fire detection coverage met the intent of BS 5839‑6, particularly in areas where higher‑risk ventilation equipment is installed.

Davin Gee commented: “We at Flagship Housing continuously look at ways to prioritise our residents’ safety whilst at home. One way that we could do that is by increasing fire detection within properties with MVHR and PIV systems. Due to the potential for mechanical ventilation and interconnected ductwork to accelerate the spread of smoke and fire, enhanced detection ensures earlier warning for occupants, mitigates ventilation-related risks, and provides an appropriate level of life safety, particularly for vulnerable residents.”

Fire-risk drivers and life safety considerations

Fire‑safety risks associated with ventilation systems do not generally arise from the units themselves. Instead, guidance consistently highlights risks linked to ductwork, compartment penetration, specification of materials, and the movement of smoke through properties.

Many of the most serious incidents continue to involve smoke spread and compartment failure, reinforcing the importance of effective containment measures.

For Davin Gee, the primary driver for this project was the need to prevent smoke being moved throughout a property during a fire event. While ventilation systems are essential for everyday living conditions, active airflow during a fire can unintentionally aid smoke spread.

By ensuring fire detection is installed in the same areas as PIV and MVHR units, and by automatically isolating ventilation systems when an alarm activates, the approach directly targets one of the most significant life safety risks within the home.

Integrated fire safety solution

Flagship Housing adopted a standardised specification for all properties fitted with PIV or MVHR systems.

Each applicable property is equipped with:

• Ei3024 Multi-Sensor Fire Alarm – Provides enhanced smoke and heat detection.
• Ei428 RadioLINK Relay Module – Isolates the ventilation system upon alarm activation, helping limit smoke and fire spread.
• Ei1000G The Gateway – Enables remote notification of alarm activations and provides live compliance data.

This integrated approach ensures protection for residents while giving Flagship Housing immediate visibility should an incident occur. 

Implementation and installation

Installation is being completed by Karma Electrical & Fire Systems Ltd, an Aico Platinum Partner.

Platinum Partner is an Aico initiative that rewards installers who meet Gold Standard Installer requirements, are registered with NICEIC and hold an ISO 9001Quality Management system certification. 

All installers involved are fully trained and competent, having completed Aico Expert Installer training, Introduction to Damp and Mould, and the City & Guilds assured AA2426‑01 course. Early installations were supported on-site to ensure consistency and best practice from the outset.

Karl Sharman, Managing Director at Karma Electrical & Fire Systems Ltd, commented: “The Aico system is incredibly straightforward to install. From an installer’s perspective it’s well designed, logical, and easy to integrate with ventilation systems. More importantly, it gives the Registered Social Landlord far greater visibility of compliance and resident safety than traditional standalone alarms.”

Key outcomes

The project, initially for the 150 homes where Flagship Housing has ventilation systems installed, now sees that any property that has been retrofitted or any new builds will have these systems installed.

The scheme has already delivered benefits, including:

• Improved resident safety
• Reduces risk of smoke and fire spread within dwellings
• Improved assurance of compliance with BS 5839-6
• Immediate notification to Flagship Housing when alarms activate

Residents benefit from safer homes, while Flagship Housing gains improved oversight and confidence in its fire safety strategy.

Programme status and future specification

The rollout across existing properties is currently underway, with completion expected shortly.

For all new PIV and MVHR installations, this specification will now form the minimum standard, embedding fire safety considerations at the point of design rather than as a retrofit measure.

Trevor Sawyer, Relationship Manager at Aico, said: “I’m extremely proud to have been part of this collaborative approach with Flagship Housing. By strengthening fire detection in properties with MVHR and PIV systems, we’re not only enhancing compliance, but more importantly, helping to make homes safer for residents. It’s rewarding to support a forward-thinking organisation that places tenant safety at the heart of its decision making.”

This project highlights the value of strong collaboration between housing providers, manufacturers, and competent contractors. By focusing on smoke containment, automatic ventilation isolation, and real time data, Flagship Housing has implemented a proactive, resident‑focused fire safety solution that goes beyond basic compliance.

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Ruth MacEachern, Product Manager at EnviroVent discusses PIV and MVHR and choosing the right ventilation strategy for healthier indoor environments

As awareness of indoor air quality continues to grow in line with new regulations like Awaab’s Law, ventilation is no longer viewed as a “nice to have” but a fundamental part of delivering healthy, compliant living spaces. Homes today are more airtight than ever, which brings energy efficiency benefits but also increases the risk of trapped pollutants, excess moisture, condensation, and indoor air quality issues if ventilation isn’t properly addressed.

Two of the most commonly specified whole‑house ventilation approaches in UK homes are Positive Input Ventilation (PIV) and Mechanical Ventilation with Heat Recovery (MVHR). While both are designed to improve indoor air quality, they work in very different ways and suit different property types and scenarios.

Understanding how each system functions and where it performs best is key to ensuring the right solution is specified for each home.

How PIV works

Positive Input Ventilation is a whole‑house system that works by gently supplying filtered air into the property, typically from the loft space. This continuous input of air creates a slight positive pressure inside the home, which helps to push stale, moisture‑laden air out through natural leakage points such as trickle vents, air bricks and gaps around doors and windows.

Rather than extracting air mechanically from individual rooms, PIV focuses on dilution and displacement. Pollutants such as excess humidity, odours, airborne allergens and everyday household contaminants are gradually forced out and replaced with filtered air.

Because the air is introduced at a low flow rate and filtered before entering the living space, modern PIV systems operate quietly and unobtrusively, providing background ventilation without relying on occupant interaction.

The indoor air quality and health benefits

PIV can play a particularly valuable role in reducing condensation, damp and mould, which remain some of the most common indoor air complaints in UK housing. Excess moisture generated from everyday activities such as cooking, showering and drying clothes can quickly build up in poorly ventilated homes, creating ideal conditions for mould growth and dust mite proliferation.

By constantly introducing drier external air, PIV helps to stabilise humidity levels across the entire dwelling, reducing surface condensation and limiting the conditions mould needs to thrive. This, in turn, supports better respiratory health, especially for occupants affected by asthma, allergies or other breathing conditions.

Unlike intermittent extract fans, which depend on manual operation or occupancy sensors, PIV systems run continuously, maintaining consistent air movement and improving overall air freshness throughout the home.

When PIV is the best option

PIV is particularly well suited to existing homes and retrofit scenarios, where installing a ducted ventilation system may be disruptive or impractical.

It is commonly specified in:

• Older properties with limited or inconsistent background ventilation
• Homes experiencing condensation or mould but without major structural defects
• Social housing and private rental properties where minimal disruption is important
• Occupied homes where residents need an immediate, low‑maintenance solution

Because installation requirements are relatively straightforward, PIV offers a cost‑effective and scalable way to address indoor air quality issues across large housing portfolios. Its simplicity, reliability and ease of upkeep make it a popular choice where a quick improvement in living conditions is required.

However, it’s important to recognise that PIV relies on the building’s natural leakage paths to expel air. As housing stock becomes increasingly airtight, this is where alternative strategies may be more effective.

Introducing MVHR

Mechanical Ventilation with Heat Recovery operates on a fundamentally different principle. Rather than supplying air into the property and allowing it to escape naturally, MVHR systems extract stale air from wet rooms such as kitchens and bathrooms, while simultaneously supplying fresh air to living and sleeping spaces via a fully ducted system.

What sets MVHR apart is its ability to recover heat from outgoing air. As warm, stale air is extracted, the heat is retained within the heat cell to pre‑warm the incoming fresh air, improving thermal efficiency while maintaining a continuous supply of air. This controlled, balanced airflow allows MVHR systems to manage indoor air quality with a high degree of precision.

Why MVHR delivers long‑term indoor air quality control

MVHR is particularly effective in airtight, modern properties, where uncontrolled air leakage is minimal and ventilation must be carefully managed.

Because air supply and extract rates are balanced, MVHR prevents pressure imbalances within the home, reducing draughts and helping maintain stable internal conditions. The continuous removal of humidity and pollutants directly from source rooms makes MVHR highly effective at reducing condensation and helping to protect the building fabric.

From an indoor air quality perspective, MVHR systems also offer excellent filtration, helping to reduce the ingress of outdoor pollutants and allergens, which are a growing consideration in urban environments.

When MVHR is the right choice

Under Approved Document F of Building Regulations, MVHR is suitable for a dwelling with any air permeability level, however MVHR is often suited to:

• New‑build homes designed to high airtightness standards
• Properties undergoing deep retrofit or whole‑house renovation
• Homes where energy efficiency and occupant comfort are key priorities

While installation is more complex than PIV, the long‑term benefits in terms of comfort, air quality control and energy performance make MVHR a strong choice where design conditions allow.

Choosing the right system

No single ventilation system is right for every property. The most effective solution depends on a range of factors, including:

• The age and airtightness of the building
• Existing ventilation pathways
• Occupant behaviour and lifestyle
• Budget, disruption tolerance and long‑term performance goals

In many existing homes, PIV provides a practical and accessible route to improving indoor air quality and reducing moisture‑related problems. In contrast, MVHR offers maximum control and efficiency for homes designed to support a fully ducted ventilation strategy.

What matters most is that ventilation is considered early, specified correctly, and matched to the realities of the building and its occupants. With indoor air quality now firmly on the agenda, choosing the right approach has never been more important.

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