I'll be completely honest here - I really thought I had ended up with a noisy and ineffective cooker hood... However, after not a lot of support from my kitchen supplier I contacted Rangemaster to explain that my cooker hood was not working as it should do. As an aside they did explain to me that the purpose of a cooker hood is only to extract cooking odours not steam as I had thought. Nevertheless, they sent out a factory engineer to inspect our cooker hood - he ran every test possible and eventually concluded that our kitchen installer had not installed the hood properly - the roof vent was impeding the air flow. we have now installed a new vent and all is well. I am very grateful to Rangemaster for their excellent service - I cannot fault them for their support - unlike my kitchen supplier and installer...(Ashley Ann, see separate review)