Luxair Cooker Hoods Limited

I purchased a cooker hood and it was installed by our contractor in accordance with the Luxair specifications and guidelines. The noise levels are ridiculously high and Luxair refuse to do anything about it and try to blame the way it has been installed. I have had the sound decibels tested by a sound engineer, results as follows: Level 1: Max 104.9 dB Avg: 84.4 dB Level 2: Max 108.6 dB Avg: 85.0 dB Level 3: Max: 102.3 dB Avg: 85.4 dB Boost: Max: 102.4 dB Avg: 84.7 dB The engineer originally stated the reason was the distance from Extractor Hood to the Duct outlet was root cause of the problem in addition to any bends in the ducting. We had the extractor fan disconnected from the ducting by our onsite kitchen installers as requested by Luxair and the engineers tested the sound levels again and there was no difference to the noise levels. A video of this was sent to Luxair but they then replied saying disconnecting the fan from the ducting was not a valid test despite them asking us to try that. They have come up with every excuse under the sun to avoid taking any sort of accountability that the fan is much noisier than advertised. They simply reply with 1000 word essay of technical jargon trying to defend themselves and I expect they will do the same here in response. The also keep claiming the duct is 8 meters in length but it is exactly 6 meters with only 2 bends. Our neighbour in the flat above us can hear it and we have subsequently paid to have acoustic insulation installed around the housing of the hood but there is still no improvement. We are stuck with a cooker hood which we paid over £1,300 for and now have to replace it with another one from a different company. Shame on you Luxair for selling cooker hoods which are to loud and not as advertised. And shame on you for your total disregard to take accountability and resolve the problem.