Envira 45 – Single Room Alternate Flow Heat Recovery Fan for Mould Control
User Guides & Data Sheets
- Advanced alternate flow heat recovery, up to 75% efficiency.
- Extracts damp air, supplies fresh pre-warmed air; 45 m³/h airflow.
- Reliable protection against black mould, damp, and condensation.
- Ultra-quiet operation (21 dB), extremely low energy use (2.4 W).
- Easy wall installation—ideal for bathrooms, kitchens, and utility rooms.
The ENVIRA-45 is a next-generation ventilation fan, engineered to tackle mould and condensation in your home, without losing valuable heat.
What sets the ENVIRA-45 damp control unit apart is its advanced alternate flow heat recovery system.
First, it extracts stale, humid air from your room, capturing the heat before it escapes. Then, it reverses direction, drawing in fresh outdoor air and warming it with the stored heat.
This efficient two-minute cycle runs continuously, so your home is always ventilated with fresh, pre-warmed air.
The result? A reliable, energy-efficient ventilation system that protects against black mould, damp, and condensation—all while saving energy and recovering heat that would otherwise be wasted by traditional extractor fans.
ENVIRA-45 is ideal for tackling damp, mould, and condensation in problem areas such as bathrooms, kitchens, bedrooms, and utility rooms.
It’s especially effective in spaces like bathrooms where black mould prevention is essential, or in any room where poor airflow causes condensation or mildew.
With a boost airflow of 45 m³/hour, ENVIRA-45 is perfect for smaller rooms. For larger areas or whole-home ventilation, the ENVIRA-50 and ENVIRA-60 models provide higher airflows, up to 60 m³/hour, to suit bigger rooms.
By improving indoor air quality and regulating humidity, the ENVIRA range offers reliable solutions for condensation control and mould, delivering effective condensation control for landlords, homeowners, and housing associations.
Plus, ENVIRA units support compliance with modern damp and mould regulations, including Awaab’s Law—all without increasing energy costs.
ENVIRA | 45 | 50 | 60
Unlike standard extractor fans that simply expel air, ENVIRA-45 features advanced alternate flow heat recovery technology, automatically switching direction every 70 seconds.
First, it extracts warm, damp air from the room. As this air passes through a high-efficiency ceramic core, the heat is captured and stored.
Next, the fan reverses, drawing in fresh outdoor air. Before this air enters your room, it’s gently warmed using the heat stored in the ceramic core.
This continuous, automated cycle keeps your home ventilated around the clock with higher levels of indoor air quality, without losing valuable warmth.
The result: effective condensation control, mould, and damp, along with significant savings on heating costs, thanks to energy-efficient ventilation.
Fan Speed: Two ventilation modes — Low (trickle) and High (boost) — ideal for maintaining healthy airflow and providing damp control ventilation in areas affected by condensation or mould.
Airflow: Delivers up to 45 m³/hour (13 l/s) of air — suitable for smaller rooms that need higher levels of indoor air quality and better air exchange, to help prevent damp build-up and mould.
Heat Recovery: Up to 75% heat recovery efficiency. Helps retain warmth while ventilating spaces prone to humidity, reducing the risk of mould growth.
Noise level: Operates at just 21 dB from 3 metres — near-silent performance, even when running continuously.
Power Use: Extremely low energy use at just 2.4 watts — efficient and cost-effective for long-term use.
Efficiency: Consumes only 0.49 watts per litre of air moved per second, helping to keep energy bills low.
ENVIRA-45 is compact bathroom extractor with heat recovery and engineered for simple wall installation with minimal disruption.
Its streamlined design fits neatly into any external wall, making it ideal for both new builds and retrofit projects.
Installation is straightforward and designed to minimise structural work, while still delivering high-performance ventilation and effective mould prevention.
B: 150mm
B1: 153mm
L: 305 - 380mm (adustable)
L1: 35mm
L: 69mm
D: 106mm
A 115 mm core drill is recommended to provide adequate clearance and ensure the required 3% downward slope for condensation drainage.
EVIRA-45 adapts to its environment, offering tailored control for both landlords and homeowners.
In rented accommodation, landlords can lock settings to ensure continuous mould protection—ideal for social housing and compliance.
In private homes, users enjoy full control via the remote, with simple operation that allows you to adjust ventilation for comfort and energy savings as needed.
Once installed, the remote allows:
Instant On/Off Quickly power the system on or off, with automatic return to your previous settings.
Manual selection Choose between low (trickle) or high (boost) airflow to suit your needs.
Automatic boost The bathroom extractor with heat recovery automatically increases speed when humidity rises above your set threshold.
Adjustable humidity Fine-tune the humidity threshold with the included tuning tool inside the fan.
Night Mode Dims LEDs and runs quietly for 8 hours before returning to standard operation.
EVIRA--45 is purpose-built for professionals who need a straightforward, compliant solution for mould and damp—helping you meet regulations like Awaab’s Law with ease.
Whether you’re a landlord, housing officer, or installer, EVIRA-45 delivers effective, energy-efficient ventilation with minimal setup.
Commissioning options let you lock settings, preventing tenants from switching off the unit or changing critical airflow and humidity controls, ensuring consistent protection without user interference.
Ideal for social housing, refurbishment programmes, and any project needing reliable, long-term damp and mould control with a wall-mounted heat recovery unit.
If your home suffers from condensation, musty smells, or black mould, the ENVIRA-45 is a smart upgrade.
Discreetly fitting into your wall like a regular fan, EVIRA-45 works continuously to remove damp air and bring in fresh air—without losing warmth.
The advanced ceramic heat recovery core helps keep energy bills low while preventing black mould from returning, making it an ideal solution for any home.
With the remote control, you can easily switch between low and high speeds, activate night mode, or let the fan automatically respond to rising humidity.
Simple, reliable protection for your home—and your health.
For optimal performance and full compliance with building and ventilation standards, we recommend having your EVIRA-45 installed by a qualified professional.
You can choose your own trusted electrician or ventilation contractor, or benefit from our growing Approved Installer Scheme.
Our scheme connects homeowners, landlords, and developers with trained specialists who understand mould prevention, compliance requirements, and correct commissioning. This ensures your EVIRA-45 is installed to specification, operates at the right settings, and delivers long-term, reliable protection against mould and damp.
Whether you’re retrofitting a single unit or planning a larger rollout, professional installation provides peace of mind—and demonstrates your commitment to protecting your property.
Interested in becoming an Approved Installer? Contact us today to join the scheme.
The EVIRA-45 is designed to help landlords and homeowners meet key UK regulations for ventilation, damp, and mould control.
It supports compliance with Awaab’s Law, part of the Social Housing (Regulation) Act 2023, which legally requires landlords to address hazards like damp and mould within strict timeframes.
By providing consistent airflow and automatic humidity control, EVIRA-45 helps prevent mould build-up and keeps properties within legal requirements.
The system also aligns with Building Regulations Approved Document F, setting the standard for minimum ventilation and indoor air quality to prevent condensation.
Whether for new builds or retrofit projects, EVIRA-45 helps you meet these standards in kitchens, bathrooms, and other high-humidity areas.
Additionally, the system fits within PAS 2035 guidelines—the government-backed standard for energy-efficient home retrofits.
The EVIRA-45 comes standard with a white acoustic baffle vent, designed for external wall installation. This vent reduces external noise while maintaining optimal airflow—allowing the unit to ventilate effectively without compromising comfort.
If you prefer a vent that blends more seamlessly with your property’s exterior, alternative colours are available, including black, grey, brown, buff, and terracotta. These options are ideal for matching brickwork, render, or cladding, making them especially popular for retrofit projects where aesthetics are important.
For maximum design flexibility, a primed metal vent is also available. This can be painted in any RAL or BS colour, allowing architects, installers, or homeowners to customise the finish to meet specific planning conditions or design requirements.
Whether your priority is quiet performance, visual discretion, or a bespoke colour match, the EVIRA-45 venting options make integration easy for any building project.
1. What’s the best way to stop mould and condensation in my bathroom or bedroom?
The most effective way to stop black mould and control condensation is by reducing indoor humidity and improving airflow.
Installing a wall-mounted heat recovery fan provides consistent ventilation, removes excess moisture, and helps prevent mould build-up in high-risk areas like bathrooms, bedrooms, and utility rooms.
2. How does a heat recovery fan work for mould prevention?
A heat recovery ventilation unit uses alternate flow technology: it extracts damp, stale air and replaces it with fresh, filtered air while recovering up to 75% of the heat.
This process keeps your home ventilated and reduces condensation, making it harder for mould and damp to take hold—improving indoor air quality.
3. Are heat recovery fans energy efficient and do they lower bills?
Yes—these energy-efficient ventilation fans are designed to save heat while running on just a few watts of power.
By recovering warmth from outgoing air, a heat recovery unit reduces heating costs and keeps your home comfortable, making it a cost-effective solution for damp and mould control.
4. Will a heat recovery fan make my home cold in winter?
No.
Alternate flow heat recovery fans are engineered to minimise heat loss by storing warmth from extracted air and transferring it to incoming air.
This keeps your rooms well-ventilated without the cold draughts associated with traditional extractor fans.
5. Are heat recovery ventilation fans noisy?
No—modern heat recovery fans operate at very low noise levels, often as quiet as 21 dB.
They’re suitable for bedrooms, living spaces, and anywhere you want discreet, reliable condensation control.
6. Do I need a professional to install a wall-mounted heat recovery fan?
For optimal performance and to meet Building Regulations, professional installation is recommended.
Qualified installers ensure the fan is correctly fitted, commissioned for the right settings, and fully compliant with current damp and mould regulations.
7. How often should I clean or service a heat recovery ventilation fan?
Most units require only occasional cleaning of filters and external vents to maintain peak energy efficiency and air quality.
Always follow the manufacturer’s maintenance guidelines for best results.
8. Can a heat recovery fan help me comply with damp and mould regulations like Awaab’s Law?
Yes.
Installing a compliant heat recovery ventilation fan supports Awaab’s Law by providing automatic humidity control and reliable airflow.
This helps landlords and property managers meet UK legal standards for damp and mould prevention in rented homes.
9. Where should I install a heat recovery fan in my house?
Heat recovery fans are ideal for problem rooms prone to condensation—such as bathrooms, kitchens, bedrooms, and utility rooms.
They’re suitable for both new builds and retrofit projects in social housing, private rentals, and family homes.
10. Do heat recovery fans work in small rooms or flats?
Absolutely.
Compact, wall-mounted heat recovery units are specifically designed for single rooms, flats, and apartments—delivering effective mould reduction and improved air quality in smaller spaces.
| EAN Number | 5056194054430 |
|---|---|
| Energy Rating | A |
| Filter Type | G3 Disc |