Combustion furnace and infra-red radiant heating system

An improved radiant heating system comprising in combination a fluid-fired burner, a combustion chamber and, extending from said chamber, a tubular conduit for receiving the products of combustion from said burner and radiating infrared energy to the surroundings, wherein the improvement comprises a combustion chamber comprising a sheet metal shell and sheet metal end members, said shell being provided with an imperforate lining of a refractory material, whose internal surface is tapered at each end thereof, whereby the tapered surface at one end of said chamber has a high degree of taper to an axially positioned collar for receiving the air tube of a fluid-fired burner, and mounted in said collar, an axially positioned air tube of said fluid-fired burner having means for forcing air through the burner and combustion chamber, and the tapered surface at the other end of said chamber has a low degree of taper to a narrow outlet end, said outlet end having means to mount said tubular heating circuit extending away from said combustion chamber, the tapers of said one and other ends being such that pulsation is essentially eliminated and back pressure in the chamber is minimized.