ONLY INCLUDES THE 3-PARTS SHOWN. YOU WILL USE THE TOP PART PLUS ONLY ONE OF THE OTHER TWO PARTS (depending whether you want to draw air from under the floor or from the rear of the stove, usually through the wall behind the stove).
Enables you to connect direct-air to the stove thereby avoiding any external air entering the room. "Direct air" is instead of the usual "hole in the wall" air-vent and involves the stove drawing air along a tube from outside the building.
Note that with a 5kW stove an air vent is not required at all unless the building is "well-sealed against drafts" (most new-builds require an air vent).
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