I currently have an old recirculating BOSCH cooker hood, which is hopeless at getting rid of fumes. I am planning on replacing this with a ducted type. I live on the top floor with the loft above me and a roof. There is no other way but to duct through the loft and out of the roof, the kitchen is open to the living room "open plan" and ducting across the room to the outside wall just won't look nice.
My questions are as follows:
Can I duct through the loft and out of the roof? I will make sure that the duct pipe is at a slight angle so that condensation or rain, if it ever makes its way through, doesn't come back down.
The roof is covered with felt and not tiled. What should I use as the outlet? and where can I buy one from?