<p>The present invention relates to an improved fuel burner apparatus which includes a hollow outer shell having a hollow inner liner supported therein so that an air passageway is formed between the inner liner and the outer shell and the interior of the inner liner forms a fuel-air combustion chamber. One or more openings are disposed in the inner liner so that a portion of combustion air flowing through the air passageway is admitted as secondary air directly into the interior of the inner liner.</p>
