Room sealing air kit for AIRTIGHT HOUSES ONLY: DG Ivar 5, 8 and Aste (DESPATCHED DIRECT FROM DG)Some properties are particularly "airtight" and even some new builds will fall into this category. In these cases an air vent is required to allow air into the room where the stove is situated, to replace the air the stove sends skywards. This product enables you to connect your stove to the outside of the building with a flexible pipe, thereby avoiding the need for an air vent in the room. Note that with a 5kW stove an air vent is often not required