Direct vent fireplace assembly

A method of heating or providing a decorative flame comprising:

• Igniting a fireplace assembly comprising:
• A fireplace unit comprising:
• A direct-vent combustion system comprising an air inlet and an air outlet or exhaust for waste combustion gases, wherein the inlet and outlet are sealed off from each other,
• A pre-combustion chamber for entry of a primary fuel and air mixture;
• A burner unit, the burner unit comprising a burner, a base plate with metered holes or slots configured to allow control of the place, volume and flow of air flowing from the air inlet into a mixing combustion chamber from the burner unit, and
• An ember bed located around the burner configured to create the mixing combustion chamber in the burner unit wherein a desired flame presentation is enhanced by controlling mixing of incoming air with the primary fuel and air mixture.