Radiant tube fired with two bidirectional burners

An improvement for a radiant tube heating system having a bi-directional burner at the ends thereof, the bi-directional burners serving as burners for combustion air and discharge openings for products of combustion, the improvement comprising a first eductor, means to connect said first eductor to a first burner, said first eductor having a jet nozzle and a throat, a second eductor, means to connect said second eductor to a second burner, said second eductor having a jet nozzle and a throat, first means to operate the second burner and the jet nozzle of said first eductor pulling combustion air through said throat of said second eductor for firing said second burner while discharging the products of combustion thereof through said first eductor, second means to operate the first burner and the jet nozzle of said second eductor pulling combustion air through said throat of said first eductor for firing said first burner while discharging the products of combustion thereof through said second eductor and means to alternately selectively operate said first means and said second means to heat the radiant tube.