The boiler is a Volkera, about 10 years old The cooker hood is a baumatic, brand new
The cooker hood vent (outside wall end) has a plastic flap on it that closes when the fan is not running. The pipe from the cooker hood to the hole in the wall is at least 6 foot in length if that makes any...
Does anyone know what the minimum distance should be between a cooker hood extractor vent and a boiler flue vent? My plumber has put the new cooker hood extractor vent 6 inches away from the combi boiler flue.