So got a Neff cooker hood and have already set up extraction via 100mm piping to outside house. The questions on the outside of the house i have put a louve grill that attaches to pipe the pipe in turn comes in through the wall on to the top of the cooker hood connection. I have now noticed that where the pipes connects to the cooker hood it has a place for a non return valve however i have not got one in the box or with the vent kit.
Is the non return valve important ? whats it stop the cold air coming in? if so anyone know where i can get the 100mm valve if its needed? Just that looked around and all i can find is a very expensive valve
Thanks
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