Abstract: The improved fuel-air mixer tube is devoid of secondary air ports and includes a passage for flowing gaseous fuel to a burner and a restrictor accelerating such gaseous fuel through a region of maximum gas velocity. An air entry port is in flow communication with such region for supplying primary air required to form a combustible mixture. The tube is thereby naturally aspirated and gaseous fuel and air are turbulently mixed to form a substantially homogeneous mixture.

Abstract: An improved bar burner is provided for use in a cooking grill having a top cooking area. The bar burner includes an elongate body having a pair of curved ends and a pair of substantially parallel sidewalls extending between the curved ends. A plurality of holes is distributed along each side wall for flowing combustible gas from the interior to the exterior of the body. Each curved end also has a plurality of holes for flowing gas to the exterior of the body. The holes in each curved end are arranged to define an end zone and a pair of angularly facing side zones. The holes in the side zones have enlarged cross-sectional areas, thereby providing improved heat rejection. The cross-sectional areas of the holes defining the angularly facing side zones are generally equal to one another and greater than the cross-sectional areas of the holes distributed along each side wall and in the end zones.

Abstract: A gas burner element includes a diffusion chamber and a plurality of burner arms extending from the chamber, the chamber and the arms having a plurality of holes for flowing gas therethrough. A support member is received in the underside of each of the arms for adjustably mounting the element in a spaced relationship from a burner kettle and for maintaining the relationship when mounting is complete. Each support member includes an upper, generally vertical shaft threadably engaged to its associated arm and a lower foot portion disposed radially to the shaft. The spaced relationship between the burner kettle and the burner element are adjustable by rotating the support member in one direction or another, thereby extending or retracting a support member with respect to its related burner arm.