Vent-Axia 403833 Lo-Carbon Tempra SELV LP Heat Recovery Unit Longer Cell & Pullcord
Vent-Axia 403833 Lo-Carbon Tempra SELV LP Heat Recovery Unit – Long Cell with Pullcord
The Vent-Axia 403833 Lo-Carbon Tempra SELV LP Heat Recovery Unit is a compact, energy-efficient through-the-wall ventilation solution designed to provide continuous fresh air while recovering heat from extracted air. Featuring a Safety Extra Low Voltage (SELV) design, 460mm long cell and pullcord control, this decentralised mechanical ventilation with heat recovery (dMVHR) unit is ideal for bathrooms, kitchens, toilets and utility rooms in residential properties and social housing.
Designed to fit a standard 100mm diameter wall opening, the Tempra SELV LP is particularly suitable for refurbishment projects and replacing conventional extractor fans. Its advanced heat exchanger achieves up to 78% temperature efficiency, helping reduce heat loss, improve indoor air quality and minimise energy consumption.
Key Features
- SELV Operation: Safety Extra Low Voltage design for applications requiring low-voltage ventilation equipment.
- Heat Recovery Efficiency: Recovers up to 78% of heat from extracted air, helping minimise heat loss and improve energy efficiency.
- Extended 460mm Cell: Designed for installation through walls measuring between 321mm and 460mm thick.
- Pullcord Control: Convenient manual operation for controlling ventilation.
- Continuous Ventilation: Selectable extraction rates of 6 l/s or 9 l/s, with boost operation up to 15 l/s.
- Low Energy Consumption: Efficient Lo-Carbon EC/DC motor consumes as little as 3.2W at trickle speed.
- Quiet Performance: Operates at noise levels as low as 20dB(A), helping maintain a peaceful indoor environment.
- Compact 100mm Installation: Fits existing 100mm wall openings, making it suitable for extractor fan replacement projects.
- Summer Extract Mode: Manual extract-only setting helps prevent unwanted heat recovery during warmer weather.
- IPX4 Protection: Splash-resistant construction suitable for appropriate bathroom and utility room installations.
- Easy Maintenance: Accessible heat exchanger simplifies routine cleaning and servicing.
Efficient Heat Recovery Ventilation
The Vent-Axia Lo-Carbon Tempra SELV LP uses a compact heat exchanger to recover warmth from outgoing stale air and transfer it to incoming fresh air. This process helps maintain comfortable indoor temperatures while reducing the energy normally lost through traditional extract ventilation.
The unit can operate continuously at 6 l/s or 9 l/s, with a boost extraction rate of 15 l/s when additional ventilation is required. For intermittent extract applications, the unit can be configured to operate at 15 l/s.
Its airflow design maintains slight negative pressure within the ventilated room, helping limit the movement of humid air into adjoining areas. This makes it particularly useful in rooms where moisture and condensation control are important.
Low-Energy and Quiet Operation
Equipped with an efficient Lo-Carbon EC/DC motor and twin impellers, the Tempra SELV LP delivers reliable ventilation while consuming as little as 3.2 watts at its lowest continuous extraction setting.
With sound levels as low as 20dB(A), the unit provides discreet ventilation for residential environments where low operating noise is desirable.
Ideal Applications
- Bathrooms and shower rooms
- Kitchens requiring continuous extract ventilation
- Toilets and WC facilities
- Utility rooms and laundry areas
- Social housing and residential properties
- Home renovation and refurbishment projects
- Replacement of existing 100mm wall-mounted extractor fans
- Installations requiring SELV ventilation equipment
Technical Specifications
- Manufacturer: Vent-Axia
- Product Code: 403833
- Product Range: Lo-Carbon Tempra
- Model: SELV LP – Long Cell with Pullcord
- Ventilation Type: Decentralised Mechanical Ventilation with Heat Recovery (dMVHR)
- Electrical Design: Safety Extra Low Voltage (SELV)
- Installation Type: Through-the-wall
- Duct Connection Size: 100mm diameter
- Long Cell Length: 460mm
- Suitable Wall Thickness: 321–460mm
- Heat Recovery Efficiency: Up to 78%
- Continuous Extraction Rate: 6 l/s or 9 l/s
- Boost Extraction Rate: 15 l/s
- Minimum Power Consumption: 3.2W
- Noise Level: As low as 20dB(A)
- Motor Type: Lo-Carbon EC/DC with twin impellers
- Control Type: Pullcord
- Summer Mode: Manual extract-only operation
- IP Rating: IPX4
- Applications: Bathrooms, kitchens, toilets and utility rooms
Simple Installation and Maintenance
The Vent-Axia 403833 Tempra SELV LP is designed for straightforward installation through an external wall using a standard 100mm diameter opening. Its extended 460mm cell accommodates wall thicknesses from 321mm to 460mm, making it suitable for properties with thicker external walls.
The compact heat exchanger allows the unit to replace many conventional 100mm extractor fans while providing the additional benefits of heat recovery ventilation. Its accessible construction also makes routine maintenance and heat exchanger cleaning straightforward.
For installations requiring extra-low-voltage equipment, the SELV configuration offers a suitable ventilation option when installed in accordance with the manufacturer's instructions and applicable electrical regulations.