Kair Centrex Inline MEV Unit
Kair Centrex Inline MEV Unit
The Kair Centrex Inline MEV Unit provides continuous whole-house ventilation for modern homes and refurbishments. Designed for low energy consumption, quiet operation, and reliable humidity control, it’s ideal for dwellings up to 185m² and complies fully with UK Building Regulations Part F.
Key Features & Benefits
- Continuous extraction from multiple wet rooms (kitchen, bathroom, utility)
- Quiet EC motor – down to 20 dB(A) at trickle
- Ultra-low energy usage (SFP from 0.20 W/l/s)
- Optional humidity control and timer models
- Single discharge grille – less ducting, fewer dampers
- Compact, lightweight body – loft, ceiling or void install
- Fully compliant with Part F and Part L Building Regulations
General Overview
The Centrex MEV is a low-profile mechanical extract unit that continuously removes moist, stale air from wet rooms. Designed for new builds and refurbishments alike, it’s easy to install, energy efficient, and extremely quiet in operation.
Energy Efficiency
Powered by a low-energy EC motor, the Centrex achieves a Specific Fan Power as low as 0.20 W/l/s, keeping running costs minimal while delivering optimal airflow.
Control
- Trickle, Boost, and Purge speeds – installer adjustable
- Overrun Timer (0–30 minutes) included
- Humidity sensor available on HT models
- Boost can be triggered via: light switch, humidistat, PIR, thermostat, pull cord
Installation
Install in ceiling voids, lofts, or cupboards. Can be mounted vertically or horizontally. Spigots support round or rectangular ducting depending on model (125mm or 204x60mm).
Technical Specifications
| Feature | Specification |
|---|---|
| Max Airflow | 108 l/s |
| Power Consumption | Max 46W |
| Noise Level | 20 dB(A) @ 3m (trickle) |
| IP Rating | IPX4 |
| Duct Size | 125mm or 204x60mm |
| Weight | 7 kg |
Performance Data
Maximum airflow: 108 l/s | Specific Fan Power (SFP): 0.20 W/l/s | Multiple speed options with breakout sound as low as 10.5 dB(A) at 40% speed.
Dimensions
Please refer to the product datasheet for dimension diagrams. The unit is compact and low profile, with integrated spigots and mounting plate.
Compatible Accessories
- Fire dampers, silencers, ducting & grilles
- Air filter cassettes
- PIR sensors, humidistats, timer switches
Downloads
Need Help Specifying This Unit?
Contact our team for technical support or product advice.
Email: hello@kair.co.uk | Tel: 020 8463 9695
Product Features
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For dwellings up to 185m² with maximum airflow of 108 l/s
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Models available with integral timer and humidity sensor (T / HT options)
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Variable speed settings: Trickle, Boost, and Purge
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Ultra-low profile, compact body – fits lofts, ceilings, and voids
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Quiet EC motor with backward curved impellers for low noise levels
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Cost-saving design – single discharge point, fewer ducts and dampers
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Multi-spigot versions available with 3 extract points and 1 discharge outlet
General Product Information
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Continuous Mechanical Extract Ventilation (MEV) for whole-house air extraction
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Promotes healthier indoor air quality by removing stale, humid air
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Manufactured in the UK – ISO9001 certified
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CE / UKCA marked – safe and compliant
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Compatible with 125mm round or 204x60mm rectangular ducting
Energy Efficiency
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Low-energy EC motor – Max power consumption: 46W
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Specific Fan Power (SFP) down to 0.20 W/l/s
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Designed for energy-efficient homes and Part L compliance
Health Dividend
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Reduces risk of mould, condensation, and airborne pollutants
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Ideal for homes with allergy or asthma concerns
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Supports humidity control via integral humidistat (HT models)
How It Works
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Operates continuously at a preset trickle speed
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Boost activates via switch, humidistat, PIR, or thermostat
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Overrun timer keeps fan running for 0–30 minutes after boost deactivates
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Purge speed setting available (installer adjustable)
Control
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Operates continuously at a preset trickle speed
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Boost activates via switch, humidistat, PIR, or thermostat
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Overrun timer keeps fan running for 0–30 minutes after boost deactivates
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Purge speed setting available (installer adjustable)
Installation Instructions
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For ceiling, loft, or void installation
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Can be mounted horizontally or vertically
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Pre-wired with 4-core cable for ease of connection
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Includes mounting bracket and anti-vibration plate
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Multi-spigot model simplifies duct runs for multiple rooms
Product Specifications
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Max Airflow: 108 l/s
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Max Power: 46W
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Operating Current: 0.74A
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Weight: 7kg
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Operating Temp: Up to 60°C
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Construction: Galvanised sheet steel
Product Maintenance
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Tool-free access panel for cleaning motor and impeller
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Annual maintenance recommended
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Filter kits and accessories available separately
Electrical Safety
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IP Rating: IPX4
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Must be earthed and installed per IEE & Building Regs
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Requires triple-pole isolator (3mm contact separation)
Regulations
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Part F & Part L1A 2013 Building Regs
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EMC Directive 2014/30/UE
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LVD 2006/95/CE
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IEC60335-2-80
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RoHS Directive
Performance
| Mode | Airflow (l/s) | Power (W) | Breakout dB(A) @3m |
|---|---|---|---|
| Max Boost | 108 | 46 | 28.2 |
| Max Trickle | 101 | 45 | 27.2 |
| 80% Speed | 80 | 26 | 22.5 |
| 60% Speed | 60 | 12 | 17.4 |
| 40% Speed | 40 | 6 | 10.5 |
Product Dimensions
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CX125: Compact round spigot layout
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CX204: Rectangular spigot version (204x60mm)
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Multi-Spigot: 3 Extract / 1 Discharge spigots
Performance Specifications
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High airflow capability with low energy input
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Fan curve graphs available for exact duty-point planning
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Operates efficiently across variable duct runs
WHY SPECIFY Kair™
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Proudly British – UK-designed, UK-built
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Designed for long-term reliability and easy maintenance
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Compatible with full Kair ducting and grille systems
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Backed by a 3-year warranty (1 year parts & labour, 2 years parts only)
Available Accessories
Compatible accessories available:
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Fire dampers, air valves, filter cassettes, silencers
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125mm / 204x60mm ducting
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External grilles and wall cowls
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Smart sensors, timers, and switches