wall to provide communication between the mixing plenum 50 and the nozzle forced air and fuel is thoroughly mixed in the burner nozzle the inshot burner nozzle 60 extends forwardly through the enclosure 52 and housing 20 to be received within the rear end of the blast tube 26 a ceramic element 62 is positioned at the output end of inshot burner nozzle 60 ceramic element 62 has a plurality of small angularly spaced orifices 63 which form a venturi to direct a finely divided mixture of air and fuel generally axially toward a target 64 the target is axially spaced from the output end of the nozzle 60 and is centrally located in the output stream exiting the nozzle to provide a contact surface generally perpendicular to the stream for igniting the gases exiting the burner the target 64 may be formed from stainless steel having a circular shape on the order of approximately 0 75 inches in diameter with an integral l shaped mounting bracket 65 the end of the mounting bracket 65 is rigidly secured to the underside exterior output end of nozzle 60 target 64 is positioned interiorly of the blast tube 26 generally axially aligned with switch 32 as best illustrated in fig3 the bold arrows in the drawings represent the fuel path through the power burner a rotatable sleevelike air shutter 66 is mounted to nozzle 60 at the input portion of the nozzle the air shutter is rotatable to selectively partially cover air openings 56 to regulate the flow.