What makes Longus unique?

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    Withstands low operating pressure (40-120 Pa) with retained function

    Longus is designed to withstand low operating pressures and operates between 40-120 Pa with retained function. Lowering the driving pressure and at the same time reducing the amount of air supplied, creates the conditions for large energy savings – while maintaining or improving the indoor climate for tenants. Traditionally, facade appliances directs the air upwards, which requires high driving pressures. The two most common reasons why you often choose not to install facade appliances are partly the high drive pressure and partly that the limits for the SFP number are exceeded.

    The Longus facade unit supplies air along the floor and may not be dependent on high driving pressures. The facade apparatus is designed to provide high capacity at low operating pressures and has become the key to several successful projects. A traditional façade solution need at pressure of 200 Pa, often with exceeded levels in the SFP numbers. In this context, traditional façade solutions are selected for renovations and tenant adjustments.

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    Possibility of higher ceiling heights in the premises

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    Installations of chilled beams in open landscapes usually create problems with draft

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    Better indoor climate both summer & winter

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    Low height of only 400 mm

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    Unique technology

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    Many advantages of parallel-connected façades

A selection of references

Why should I convert my old façade system?

Old façade systems have high operating pressures and high energy consumption, usually with high noise levels and poor air exchange efficiency (especially in the winter). Therefore, many people choose to completely change their old facade system to a completely different solution such as cooling baffles and radiators. To change from an old façade system to a roof-mounted system involves high rebuilding costs where air and water draws have to be moved, radiators must be installed and roofs must be built.

InventiAir’s façade solution Longus opens up to create a modern façade system that provides both better indoor climate and lowers energy consumption for both cooling and heating. By retaining the façade installation, you can save on operating and rebuilding costs, while reducing noise levels and greatly reducing the driving pressure.

In principle, you can convert the old system by replacing the old device with a Longus. Traditional façade units require 200-300 Pa, while Longus can operate at a pressure of 40-120 Pa. By converting to Longus, the driving pressure is reduced while keeping the SFP numbers at a recommended level.

When converting, existing installations, both linings and window sills can be retained. Consequently, a conversion leads to cost savings while improving the air principle. Contact us if you need help converting your old system. Each project is unique and we always find a solution together with the customer.

Most common question: How do Longus handle cold drafts from the window?

Longus is an induction apparatus, which means that the room air is locally cooled or heated by the water circuit, through induction in the apparatus. In conventional appliances, the induction air is taken at floor level, while Longus uses the air via the window sill.

This provides an optimum function when cold air from the window is sucked down into the grid and heated / cooled in the apparatus before reaching the room. This means that the air at the window, which is warm in summer, is cooled down before it enters the room and vice versa during the winter months (the cold air from the window is heated in the appliance). The colder air that is sucked in during the winter, the more efficient the heat exchange becomes and the same applies to the warm air during the summer.

How does Longus work?

Longus unique design supplies ventilation, cooling and heating, with a stratifying ventilation principle, to the room and the humans in the room. This makes it possible to remove excess heat and pollution from the living area with the exhaust air system. The air is supplied in a thin horizontal airflow (adjustable) along the floor, thus ensuring that the fresh air effectively reaches the living area. This creates an increased ventilation efficiency and a better indoor climate, compared to a traditional mixing ventilation system.

In conventional façade units, the induction air is absorbed into the floor while the air to Longus is taken in through the grille in the window sill, which also helps prevent cold rage.

Function during summer

Longus supplies cool and temperate air along the floor, providing a layered and stratifying ventilation, where warm and used air is allowed to rise upwards and leave the room with the exhaust air.
The effect is easily regulated on the water circuit and provides a pleasant climate in the room. The principle gives a higher ventilation efficiency with lower temperature in the living area.

Traditional facade system
Longus facade system
Function during winter

During the winter season the supply air is over-tempered. Longus supplies the air at floor level and adheres it along the floor surface (coanda effect), which means that the air stream stays at floor level until the velocity is so low that it is forced to rise.
This means that the ventilation efficiency is considerably higher than a traditional system, which supplies the air straight up along the facade (which causes the hot air to disappear directly with the exhaust air, as hot air rises).

Traditional facade system
Longus facade system

Longus creates a lower temperature in the living area and a higher temperature at the exhaust air, then traditional façade systems.

Placement of Longus

Longus can be placed along a facade or interior wall. Longus can also be integrated into interior walls, so-called Fatwalls or be integrated in furniture.
An advantage of these installations is that the induction grille does not need to be mounted horizontally, but can be placed vertically against the wall (for the induction air to reach the battery).
Longus is available in two different variants and can withstand a height of 400 mm from floor to the window sill (Longus Mini).
If there is previously an installation of facade units along the facade, can the old installation and cladding easily be reused.

Dimensions & connections

Product nameHeight (H)Length (L)Length (L1)Width (B)Connection waterConnection vent
Longus 60044460270217512100
Longus 80044480290217512100
Longus 10004441002110217512100
Longus 12004441202130217512100

Capacity- & adjustment diagram (k-factor per nozzle is 0.04)