Method and apparatus to provide ventilation for a building

A method for providing exterior fresh air into an interior of a building, the method comprising:

• providing a manifold comprising:
• an exterior air inlet port that allows the exterior air into the manifold,
• an interior air inlet port that allows air from the interior of the building into the manifold,
• an interior air outlet port that allows air from the manifold to enter the interior of the building,
• a furnace combustion fan outlet port that allows air from the manifold to pass to a furnace combustion fan of a heating system of the building and thence to an exterior of the building,
• a movable gate that directs air within the manifold by being adjustable through a range of positions, and
• a control means for operating the moveable gate;
• adjusting a position of the moveable gate into one of two main positions, the two positions including a first position and a second position;
• and
• directing air through the manifold;
• wherein when the moveable gate is in the first position the exterior air enters the manifold through the exterior air inlet port and exits the manifold through the furnace combustion fan outlet port such that air passes through a furnace combustion chamber of the furnace and subsequently passes to the exterior of the building;
• and wherein when the moveable gate is in the second position the exterior air enters the manifold through the exterior air inlet port and exits the manifold through the interior air outlet port and subsequently passes to the interior of the building while the air from the interior of the building enters the manifold through the interior air inlet port and exits the manifold through the furnace combustion fan outlet port and subsequently passes to the furnace combustion fan of the heating system of the building, such that the exterior air is introduced into the interior of the building while air from the interior of the building is used to provide air for furnace combustion and which is exhausted to the exterior of the building through action of the furnace combustion fan.