Abstract: A gas burner is provided with a shaped part at its upstream end for the admission of primary air and gas, the shaped part 24 being monolithic with the burner and having openings 34, 36 for the admission of primary air from above, and is downwardly open for admission of air from below, the part receiving a primary air shutter 52 which is generally cylindrical to fit in telescoping relation upon the burner end part 24, the shutter having a lower slot 56 to accommodate the seam 18 of the burner, and the shaped part having a downwardly open saddle 38 adapting the burner upstream end to be seated on a gas spud.