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This paper describes the effect of variations in the depth of the metal through which the ports are drilled on the limits of operation of domestic gas burners. Quantitative data are presented showing the effect of varying the depth of port from 1% in. to ~2 in. on the limits of flash back, blowing, and yellow tips, as well as on the proportion of primary air injected. These data were obtained with two gases of different composition and with four different port sizes. The effect of turbulence on the position of the burner limits is also discussed. The results obtained indicate that a compromise between all the factors involved might result in the selection of a port X in. in depth as the most practicable. CONTENTS Page

Effect of the depth of drilled ports on the limits of operation of domestic gas burners