[. . . ] [. . . ] The change in the ANSI standard has forced the redesign of the air intake to the burners on the water heaters, resulting in the sealing of the access panel of the burner chamber. This sealing of the access panel into the burner chamber area eliminates the ability to route a bleed tube from the vent side of the gas pressure switch into the burner chamber. To eliminate the need of installing the bleed tube, orifices are installed into the gas pressure switch inlet and vent ports. These orifices are used to restrict the flow of gas through the pressure switch in the event of a rupture of the switch diaphragm. [. . . ] [. . . ]