Should my chimney cooker hood have a flue?
There are two basic stove/range/hob type hoods. Externally vented would have a flue of some sort that vent smoke ,fumes and odors to the exterior. An internally vented type just filters and recirculates the air back into the kitchen. To make things more confusing most hoods can be set up to operate in either mode. The conversion usually involves installing or removing a metal blocking plate. Both styles require occasional cleaning of the filters to limit grease buildup. I would want to verify that the hood is installed correctly. With the fan on high you should feel air being drawn in and exhausted somewhere. It may be drawn in and exhausted under the hood. Make sure that the unit does not vent into an interior wall cavity or an attic as this would be a fire hazard.