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This time we took out the ventilation ducts of the house ourselves, connected diffusers, collectors, and drilled holes. Become a sponsor on PATREON 💰 / do-it-yourself How much it cost us in money and nerves, all in the video. Why did we do it ourselves? Because we got a consultation from the people we bought from, they made a diagram for us, so it wasn't difficult to get it out. We will see how it will be with the connection of the recuperator. If we had hired everything: Drilling the holes would have cost 180 eur, and one crown cost us 8 eur. The entire work shown in the video would cost 500 eur. We did it in 2 days. SUBSCRIBE - Questions? - comment.