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e² with heat recovery

Controlled home ventilation with the e² with heat recovery


High-efficiency motors with the latest ec-technology in combination with flow-mechanically revised and specially balanced fans have almost eliminated the well-known air noise. ... learn more

Environmentally friendly

With a converted power consumption of only 0.09 W/m³/h, the e² is unsurpassed in energy efficiency, thus making an active contribution to environmental protection and saving money. The requirements of the current DIN 1946-6 for devices of efficiency class E are undercut by a multiple, which clearly underlines the world class of the device.


The e² works according to the well-known principle of regenerative heat exchange, which has been almost perfected by LUNOS. The so-called acuvent storage stone is located in the middle of the air flow of an ec motor with axial fan. By means of a reversing air flow, which is created by a targeted change in direction of the fan, the ceramic material is charged with the heat energy of the room air and releases it again to the outside air supplied. This happens so efficiently that only 10 % of the heating energy is lost through the ventilation. For a balanced supply and exhaust air balance, at least two or an even number of e² should be used. Equally important are efficient filters. Allergy sufferers can breathe a sigh of relief; with the optional pollen filter, pollen, dirt and suspended particles can no longer enter the home.


The e² is one of the smallest decentralised fans for domestic ventilation with heat recovery and is based on the principle of regenerative heat exchange. With the help of the most modern manufacturing processes, it has been possible to develop a compact heat storage unit made of a ceramic composite material that delivers a thermal efficiency of an average 90.6 %. The combination with highly efficient ec-motors and an intelligent control system has enabled LUNOS to develop one of the most economical fans.


If a LUNOS ventilation system is already installed, existing ALD with LUNOtherm can be replaced by the e² with heat recovery. Also in new buildings the LUNOS e² can be combined with all LUNOtherm façade elements. In combination with this only a small slot remains in the window reveal. Unpleasant grilles or large wall constructions are a thing of the past.


The LUNOS e² can be used in new buildings as well as in renovation projects. The e² is either placed between the bricks in a new building with the aid of a wall installation housing or retrofitted, e.g. in a renovation project, with the aid of a 162 mm core drill hole. The wall has to be only at least 300 mm thick. The cabling is carried out directly from the control unit, which is installed in a standard electronic box or in the sub-distribution board. From there, only three wires are required, which are subjected to 12 V protective low voltage.

Planning reliability

The building inspection approval of the e² will be extended by the DIBt at the end of the year until mid 2021.

Art.-Nr. 39993

Technical specifications
Volume flow 15 - 38 m³/h
Max. degree of heat provision 96 %
Heat supply level according to EN 13141-8 85 %
Max. standard sound level difference Dn,e,w 54 dB
Sound power level LW from 29 dB(A)
Power consumption 0.7 - 4 W
Minimum installation length 280 mm
Dimensions Ø 154 x 243 mm
Compatibility Energy efficiency class A


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