We gladly heard your positive feedback and are therefore interested in how you came to be a inVENTer-customer. Do you mind to illuminate?
R. S.: It´s my pleasure. My house was built in 1976. The first inVENTer ventilation devices were installed in 2005. In 2008 we renovated the whole house. Originally it was a prefab house- back then you called it a Neckermann-house. Whoever informs themselves about these prefab houses, quickly realises that some of these houses emit noxious substances. The was caused by a mandatory treatment of the woodwork by the national building authorities. These woodworks function as support and are distributed evenly in the walls. They are coated and in between them there is insulation material with a blocking foil.
But how did these wood-protection get to the outside?
R. S.: The prefab houses have a relatively thin outside wall with a, for that time, great insulation. But, when you are heating, from the inside, the air flows through the walls to the outside, so you in need to heat constantly. Each time, the warm air also carries an amount of humidity with it which then settles in the insulation on the blocking foil. In our house there was no mould, but the development of micro-organisms. That means we had this escaping wood-protection and the micro-organisms metabolised this gasses and produced Tetrachloroanisole.
How does the inhabitant recognise this?
R. S.: Tetrachloroanisole smells musty, but we only barely smelled it. We basically grew old with it. Eventually, was the first time that we questioned the status quo. In consequence, we firstly contacted the manufacturer of these houses who, like other manufacturers, knew about this problem.
Isn´t this considered a heath burden?
R. S.: Yes, this was our main concern, too. And then a company introduced us to the inVENTer ventilation systems and we agreed: OK, let us try this. The permanent air exchange is used to check the contamination. Previously we also had great contact with inVENTer´s founder Peter Moser. He personally advised us very well and our seven ventilation devices even were prototypes and true custom-made products- especially for our little wall thickness. But also the customer service has been reliable at all times. In the end everything worked out just as it was promised. The musty smell was barely noticeable.
We are glad to hear that. The ventilation device that developed from this prototype is called iV14-Ohio. But with the devices the source of the problem did not resolve itself, did it?
R. S.: Right. Additionally we had to use the devices more often than it is usually the case. Eventually in 2008, we decided on a total renovation of the prefab house. That means that all of the outer façade had been disposed. The support-woodworks had been impregnated and encapsulated. Furthermore, a sheep wool fleece now sucks in the left-over Tetrachloroanisole-contamination and clears it. The local heath department accompanied the whole process. Their measurements showed that the contamination level has sunk 200 times compared to the original measurements. The decentralised ventilation systems convinced us in that we continued using them after the renovation. Only a few fans were exchanged. With the respective square adapter units we were able to fit the devices to our new thicker walls.
Why did you decide for a decentralised ventilation device with heat recovery, in contrast to other ways of ventilation?
R. S.: A decentralised ventilation has the advantage that you do not need retrospective piping. That would have been an insane project in our single family home. Furthermore, I had heard from some people that their centralised ventilation caused mould and soiling in their newly built house.
Who installed your ventilation systems in 2008?
R. S.: We, ourselves installed the ventilation devices, which was relatively easy. The only problem was a facing shell that consisted of Eternit which contains Asbestos. I studied a professional journal a asked our neighbours for help- strictly according to regulations.
How often do you send time for the maintenance of the ventilation devices?
R. S.: Whenever the display tells me to and the cartridge gets cleaned twice every year. The maintenance of these devices means to exchange the dust filter. We bought a second filter set as well. Therefore we do not have to wait until the old ones are washed and dried before we can reapply them, plus we always have a spare set.
So you also undertake the maintenance yourself?
R. S.: Of course. You only need a screwdriver and a little finesse. Simply open the lid and you are ready to exchange the filter. If you really need to exchange the cartridge, you will have to screw open the filter-holder that is attached to the adapter-piece.
Every decentralised ventilation system comes with a controller. What are your experiences with that?
R. S.: My controller is called ZR30. It only needed a quick familiarisation phase for the easy operation. For example, I can switch the operation mode to Eco, meaning the reduction of performance to 25%, with a simple touch. Then the ventilation devices are hardly recognisable at all.
How satisfied are you with your inVENTer ventilation devices overall?
R. S.: Everything is just fine and in the meantime it has become twice as great that we use the ventilation systems with heat recovery. Through the renovation we practically live in a low-energy house. Nowadays, ventilation devices are obligatory in those buildings- Such being the case we can only profit. My inVENTer- ventilation devices are, as I mentioned earlier, still in operation and that for more than twelve years.
Thank you very much Mr. Rainer S, for sharing this interesting insight in your life and your experiences with your decentralised ventilation devices.
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