| | | In a multi-storey building, all the fumes are usually conveyed into a common flue pipe and then discharged outdoors. The flue pipe must comply with the UNI EN 1443 standard construction requirements. It must also be heat-insulated to prevent condensation or cooling of fumes and it must | | run vertically and be without constrictions. The hood flue pipes must run into a common flue pipe that is branched and used to this aim only. A problem that must not be underestimated is the possible use of an extraction hood without a check valve. In this | | case, a flue pipe used in common with other homes may attract the fumes and food odours of neighbouring ki tchens into your kitchen. If your hood does not have an integrated check valve, we suggest you install a separate one-way valve in the outside wall. | | |