Vent-Axia 403836 Lo-Carbon Tempra LHTP Heat Recovery Unit Longer Cell, Humidistat, Timer & Pullcord
Vent-Axia 403836 Lo-Carbon Tempra LHTP Heat Recovery Unit – Long Cell with Humidistat, Timer & Pullcord
The Vent-Axia 403836 Lo-Carbon Tempra LHTP Heat Recovery Unit is an energy-efficient, through-the-wall ventilation solution designed to improve indoor air quality while reducing heat loss. Featuring a built-in humidistat, overrun timer, pullcord control and extended 460mm cell, this decentralised mechanical ventilation with heat recovery (dMVHR) unit is ideal for bathrooms, kitchens, toilets and utility rooms.
Designed to fit a standard 100mm diameter wall opening, the Lo-Carbon Tempra LHTP is particularly suitable for residential refurbishment and social housing projects. Its compact heat exchanger achieves up to 78% temperature efficiency, recovering warmth from extracted air to help maintain comfortable indoor temperatures and reduce energy consumption.
Key Features
- Integrated Humidistat: Automatically responds to increased humidity levels, helping control condensation and excess moisture.
- Overrun Timer: Allows ventilation to continue after activation, helping remove lingering moisture, odours and stale air.
- Pullcord Control: Provides convenient manual operation when additional ventilation is required.
- Heat Recovery Efficiency: Recovers up to 78% of heat from extracted air, helping minimise ventilation-related heat loss.
- Extended 460mm Cell: Suitable for wall thicknesses between 321mm and 460mm.
- Continuous Ventilation: Selectable extraction rates of 6 l/s or 9 l/s, with boost extraction up to 15 l/s.
- Low Energy Consumption: Efficient Lo-Carbon EC/DC motor consumes as little as 3.2W at trickle speed.
- Quiet Operation: Low-noise performance of approximately 20dB(A) at the lowest operating setting.
- Compact 100mm Installation: Fits existing 100mm diameter wall openings, making it suitable for replacing conventional extractor fans.
- Summer Extract Mode: Manual extract-only setting helps prevent unwanted heat recovery during warmer weather.
- IPX4 Rated: Splash-resistant design for suitable 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 LHTP uses an integrated heat exchanger to recover warmth from outgoing stale air and transfer it to incoming fresh air. With temperature efficiency of up to 78%, the system helps reduce unnecessary heat loss while maintaining effective ventilation throughout the property.
The unit offers selectable continuous extraction rates of 6 l/s or 9 l/s, with a boost rate of 15 l/s when increased ventilation is required. For intermittent extraction applications, the unit can be configured to operate at 15 l/s.
Its airflow arrangement maintains slight negative pressure within the ventilated room, helping prevent humid air from migrating into adjoining areas. This makes the unit particularly effective for ventilation in moisture-prone spaces.
Automatic Humidity Control with Timer and Pullcord
The Vent-Axia 403836 LHTP combines three convenient ventilation control features to provide greater flexibility and improved moisture management.
- Humidistat: Detects increased humidity and automatically activates additional ventilation to help reduce condensation and moisture build-up.
- Overrun Timer: Maintains extraction after the activation signal has ended, allowing additional time to clear moisture and stale air.
- Pullcord: Enables manual activation of ventilation when required.
These combined controls make the Tempra LHTP particularly suitable for bathrooms, shower rooms and utility areas where humidity levels can change frequently.
Low-Energy and Quiet Performance
Equipped with a high-efficiency Lo-Carbon EC/DC motor and twin impellers, the Tempra LHTP consumes as little as 3.2 watts at its lowest continuous extraction setting. This energy-efficient design makes it suitable for applications requiring regular or continuous ventilation.
With operating noise levels as low as 20dB(A), the unit provides discreet ventilation while helping maintain a peaceful indoor environment.
Ideal Applications
- Bathrooms and shower rooms requiring humidity control
- Toilets and WC facilities
- Domestic kitchens requiring extract ventilation
- Utility rooms and laundry areas
- Social housing and residential developments
- Property refurbishment and renovation projects
- Replacement of existing 100mm wall-mounted extractor fans
- Properties requiring automatic humidity-controlled heat recovery ventilation
Technical Specifications
- Manufacturer: Vent-Axia
- Product Code: 403836
- Product Range: Lo-Carbon Tempra
- Model: LHTP – Long Cell with Humidistat, Timer and Pullcord
- Ventilation Type: Decentralised Mechanical Ventilation with Heat Recovery (dMVHR)
- 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
- Humidity Control: Integrated humidistat
- Timer Function: Overrun timer
- Manual Control: Pullcord
- Summer Mode: Manual extract-only operation
- IP Rating: IPX4
- Applications: Bathrooms, kitchens, toilets and utility rooms
Simple Installation and Maintenance
The Vent-Axia 403836 Tempra LHTP 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 particularly suitable for properties with thicker external walls.
The compact heat exchanger design allows the unit to replace many conventional 100mm extractor fans while providing the additional benefits of heat recovery ventilation. Its accessible construction also simplifies routine maintenance and heat exchanger cleaning.
The Lo-Carbon Tempra range is designed to meet the performance requirements for continuous extract ventilation under Building Regulations Approved Document F, subject to correct installation and system configuration.