The Defender is a beautiful air tight plate steel wood burning stove with nickel-pewter trim that accents a charcoal black finish. A Heavy cast iron door with air washed ceramic glass allows a magnificent view of the burning fire that will enhance any hearth setting. Here's how it works: The primary air inlet at the front of the stove ignites the wood upon start up. Once burning, the secondary air inlet at the rear of the firebox feeds air to the top of the stove through three (3) ignition tubes directly above the wood. The result is that you have ignition, or fire, at the bottom and at the top of the woodstove which, in effect, consumes the wood. This is a very efficient method of getting the most energy possible out of the wood that you are burning.