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Inventer IV-Light

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Ventilation System Design

We would love to design the perfect ventilation system for your needs. Our design will provide the best performance and comfort levels and comply with all necessary building regulations.

Please Note: Inventer heat recovery fans work in pairs and require a controller. A controller can power more than one fan.

If you decide not to consult with our technical team, this will be at your own risk. A professional system design is always recommended.

Ventilation System Design

We would love to design the perfect ventilation system for your needs. Our design will provide the best performance and comfort levels and comply with all necessary building regulations.

Please Note

Inventer heat recovery fans work in pairs and require a controller. A controller can power more than one fan.

If you decide not to consult with our technical team, this will be at your own risk. A professional system design is always recommended.

Request a Design Consultation

About the building and your ventilation requirements

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  • Product Overview
  • Technical Details
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  • Installation guide

Product Overview

Main purpose

Quiet and energy efficient extraction of stale air, replacing it with filtered fresh air from outside. Recovers up to 84% of heat from the extracted air to warm-up colder air coming in from outside. Functions as a single room heat recovery ventilation unit (SRHRV) within a decentralised ventilation system.

Use it on

External walls up to 495mm thick (with standard wall-sleeve) or up to 745mm thick (with large wall-sleeve), typically in bedrooms and living areas where quietest possible noise levels are required. Suitable for block, concrete, stone, timber frame and brick constructions. Minimum compatible wall thickness is 290mm. Requires 180mm hole in the wall.


The IV Light is a compact and quiet low-energy heat recovery ventilation unit with a heat recovery rate of 84%. It includes a reversible fan that can silently switch air flow direction to extract air then supply air as needed. There is also a thermal accumulator for heat recovery, an integrated dust filter and a weatherproof exterior grill. Combining these features and components provides excellent heat recovery with maximum air flow and low levels of sound emission and transmission of noises from outside.

Where to use it

The IV Light is a heat recovery ventilation unit (SRHRV) which can achieve a heat recovery rate of up to 84%. Bedrooms and living areas are common places where it is used in the home. The IV Light can be used in all sorts of buildings such as offices, schools, guestrooms, hotels etc.

This ventilation unit, like all other Inventor units with a single fan, was designed to work in tandem with another ventilation unit within the building. The second unit can be either another IV-Light, IV Smart, IV-14 Zero or IV Compact and both must be connected to the same sMove controller. The controller supplies the power to the pair of fans and neither will work without an sMove controller connection.

The IV Light can be installed into a 180mm hole, with 2° fall to the exterior, in an external wall of up to 745mm thick (or up to 495mm thick if you choose the version with a shorter wall-sleeve length). The minimum wall thickness is 290mm.

The IV Light must be positioned on the external wall, so its centre is at least 250mm away from any windows and at least 250mm away from roof eaves.  The interior side of the unit must not be covered or obstructed by furniture, fixtures, or fittings.  

What it does

The Inventer IV Light provides ventilation and heat recovery with very little sound emission and has an air flow rate of 5-21m³/hour when in heat recovery mode.  When doing extraction only, the air flow rate is 10 and 42m³/hour.

Every 70 seconds, this compact ventilation unit extracts warm stale air from inside the building and replaces it with fresh filtered air from outside. The warmth of the extracted air is used to heat up the colder external fresh air as it enters the building. This maintains the temperature in the room and ensures comfort levels are not reduced. 

Because the IV-Light is designed to work as a pair in tandem with another Inventer unit. Whenever one fan is extracting air from the building, the other paired fan will be supplying air. This ensures the air pressure within the building does not change while the fans operate. 

The IV-Light detects when incoming air drops to below 5°C and will automatically begin four extraction cycles to warm up the heat exchanger four times more than normal. This makes sure there is sufficient warmth in the heat exchanger to heat the inbound air to room temperature effectively.  

The IV-Light filters dust particles from the inbound external fresh air through a reusable G4 dust filter without reducing the airflow-rate through the unit.  A pollen filter and activated carbon filters are available as optional upgrades to remove all impurities and allergens from the inbound external fresh air. These “finer” filters will reduce the airflow rate by 25%.

The wall cover, on the interior of the wall, can be closed to prevent draughts when the fan has been switched off.  It’s also useful for when external noise is very loud or there are bad odours outside.  Simply press the cover towards the wall (blocking the hole) to close it and pull it out to re-open.

The sMove controller can have an additional sensor connected to it to enable the monitoring and regulation of humidity or CO2 levels, VOCs, or air pressure. This ensures the highest levels of indoor air quality can be achieved.

Why we love it 

The IV-Light is highly energy efficient using only 3W (A+ rating). Its sound emission level is up to 36dB (at max fan speed) and goes as low as 18dB. The fan blades have been designed especially for Inventer decentralisation units and engineered to reduce external noise. 

Closing the hole in the wall by easily pressing the front cover means you have full control of noise. Especially useful if there are roadworks outside or hot weather has caused bad odours to occur outside.  

An integrated wind stabiliser in the IV-Light ensures the air flow within the building is not affected by strong wind and gusts. 

The built-in G4 dust filter can be easily removed, washed and refitted. It should be checked and washed every four months. It can be washed multiple times but is recommended to be replaced every 12 months. If there are any holes or tears, it will need replacing immediately. 

The IV-Light is a compact unit requiring a smaller diameter hole in the wall than other fans in the Inventer range. It also looks good with its modern interior cover and its compact outer grill. 

How it works

Built into each fan is a ceramic heat exchanger. The heat exchanger absorbs heat from the warm, extracted air passing through it. After 70 seconds of extraction, the ceramic material is fully heated, and the fan silently reverses direction. When fresh air passes through the heat exchanger in the opposite direction, the ceramic material transfers heat back to the incoming air warming it up as it enters the building. 

The IV-Light and the other single fan ventilation units from Inventer operate in pairs meaning you need to have at least two (or four, six or eight) connected to the same sMove controller. Each controller creates a “zone” that can be independently controlled. You can have more controllers and pairs of fans to create additional zones as needed. One fan in each pair will extract while the other will supply air. This means the same volume of air enters the building through one fan as is extracted by the other, so the air pressure remains constant. Every 70 seconds both fans in each pair automatically switch air flow to the opposite direction, so air is exchanged evenly throughout the building and 84% of the interior warmth is retained.  This ensures excellent indoor air quality and maintains a constant air temperature and air pressure in each room.

Inventer Decentralised Ventilation

Ecological Building Systems


  • 84% heat recovery
  • Quiet fan. 18-36 dB (A)
  • 1-3W energy consumption
  • Reduces external noise by 34-47 dB
  • 5-year guarantee
  • Built-in temperature sensor 
  • Unaffected by strong wind outside
  • Circular external weather protection cover
  • Closable inner cover


  • Quiet fan 18-36 dB (A) is ideal for living areas where low noise is required
  • Recovers 84% of heat from extracted air to warm up the inbound air so a constant indoor air temperature and comfort level is maintained
  • Energy efficient 3W fan lowers running costs and carbon emissions of the building to help make an active contribution to the environment
  • Built-in G4 dust filter can be cleaned and reused many times.
  • Additional pollen filter is available to remove all pollen from inbound air
  • Closable inner cover prevents unwanted draughts when the fan is switched off and reduces noise or odours from outside
  • Below 5° C outside, the heat recovery cycle is adapted to recover more heat and ensure cold air is not supplied to the building.
  • The exterior grill is only 220mm diameter so is nice and compact on the facade


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Technical Details

Key Technical Data

Technical Datasheet

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Declaration of Performance (DOP)

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Installation Guide

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Brand/Manufacturer Brochure

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Installation Guide

Turn the power off during electrical works. All electrical connections must be carried out by a qualified professional. Seek professional advice for planning and installation of all electrical works. 

The IV-Light receives its power from an Inventer sMove controller. This should be installed first by following the controller’s installation guide.  The wire from the controller must be long enough to reach the connector on the fan’s power cable. Depending on the wall thickness, this connector could be inside the hole, so please ensure the wire is long enough to reach right to the back of the hole.  

When installed on an external wall, a 180mm wide hole will be required. The hole should have a 2° fall to the outside to allow any condensation to run off to the exterior. In walls made from brick, concrete or stone, this should be cut with a 180mm masonry core drill. 

For newbuilds, a wall mounting block is available. This block can be incorporated into the brickwork of the building for easier installation without the need for core drilling. It incorporates insulation and a 2° slope.

The best position for the fan on the wall should be worked out in advance before drilling. The fan must be positioned so the centre of the fan, internally or externally, will be at least 250mm from the edge of a window or ceiling and at least 250mm from the eaves of the roof. The internal end of the fan should be situated away from radiators, thermostats, sensors and heat sources and should not be obstructed by furniture, fixtures or fittings. Locating the unit near sensitive artworks/paintings should be avoided to avoid any damage caused by the drying effect of near constant air movement.

Once a suitable hole with a 2° fall to the outside has been created, the wall-sleeve can be cut to length. The wall-sleeve has a notch at one end. This notched end should be on the interior side of the hole. You must cut the other end. The required length of the wall-sleeve is equal to the thickness of the wall plus an extra 10mm. The aim is to have the wall-sleeve protrude by at least 10mm at the exterior end outside. 

Hint: You may find it easier to judge the length required by fitting the pipe into the hole and aligning the interior end flush with the wall (consider any internal plaster/finishes to be added later and adjust as necessary). Then make sure the wall-sleeve has a 2° slope towards the exterior. You may need to use the supplied wedges to align and secure the wall-sleeve at the correct 2° incline. From the exterior, draw round the protruding pipe with a pen or pencil to mark the wall level on the sleeve. You could use a spacer or your finger between the pen and the wall to draw the line 10mm away from the wall surface, or you can just mark the wall line, remove the sleeve from the wall and draw a second line on the sleeve 10mm further along.  Once you have a suitable line to mark the thickness of the wall including the extra 10mm, cut the sleeve and reinsert it into the wall replacing the wedges as needed. 

After the wall-sleeve is cut to length and inserted into the hole, the wall-sleeve should be rotated so the notch is towards the bottom and near where the power wires will be. The IV-Light is supplied with a white cylindrical insert. This can be inserted into the wall-sleeve to temporarily block the hole and prevent draughts while you continue the installation.

The Wall-sleeve should be a snug fit in the hole and sealed airtight at both ends. To help centre the wall-sleeve in the hole, the supplied wedges can be used (at either end) to adjust the position of the wall-sleeve and make sure the wall-sleeve has at least 2° of slope to the outside. The wedges can remain in place. Where any wedges protrude from the wall, this can be cut with a sharp knife so it is flush. Seal gaps of up to 6mm between the wall-sleeve and wall with Pro Clima Orcon F airtight sealant. For bigger gaps of up to 20mm, use Aerosana Visconn Fibre. If any gaps exceed 20mm, fill with mortar, leave it to set then seal all around with Orcon F or Aerosana Visconn Fibre. Alternatively, an expanding foam filler can be used to fill gaps around the wall-sleeve.  Once set, the foam and the wedges can be trimmed flush to the wall. As this material can crack over time and may not provide a permanent airtight seal, the foam must also be covered over and sealed with Aerosana Visconn Fibre to remain airtight for the lifetime of the building. 

If the wall has no plaster or render on it and will be plastered or rendered later, a pair of 130-170mm Pro Clima Roflex Solido airtight grommets can be used to seal either end of the wall-sleeve to the wall. This grommet is stuck to the surrounding masonry then plastered over to finish.

The external weather protection grill is the next component to be installed. The foam weatherproofing strip should be cut to 210mm and stuck to the inner edge of the wall-sleeve at the top. Take care not to put tape where the fixing points on the grill will grip the wall-sleeve. Next, put tape around the inside edge on the back of the external grill avoiding the fixing points that will grip the wall-sleeve. Please see the installation manual page 23-24 for a picture of the tape positions. 

The grill should then be fitted to the sleeve with the bars of the grill horizontal and the drip exit hole at the bottom. Insert the screws into the screw locations and tighten gently until the fixing points grip the wall-sleeve tightly and the grill is secured.  

Work now continues from the interior side. The temporary insert used to plug the wall-sleeve must now be removed. The ceramic honeycomb thermal accumulator is inserted next. Hold the handle on the accumulator and push all the way to the back of the wall-sleeve.  Then insert the fan with the wire facing toward the interior of the room. Rotate the fan, if necessary, to align the wire location with the notch in the wall-sleeve. Depending on the thickness of the wall, you might need to connect the fan to the power supply (the wire from the controller) before inserting the fan all the way in the wall-sleeve.

The inner cover can now be installed. The cover has two parts: a baseplate and a smooth top cover. The smooth top cover needs to be separated from the baseplate by pressing the small release buttons at each corner. The power wire (from the controller) should now be connected. The base plate should be fixed to the wall by using the wall plugs and screws provided. The filter is then inserted into the baseplate. The smooth top cover is then pressed over the filter onto the baseplate and clipped into place.

Installation Guide

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