Patent ID: 8328942

Claim:
An apparatus for processing a substrate, comprising: a substrate processing chamber defined such that a flat joining surface defines the substrate processing chamber into a first chamber above the joining surface and a second chamber below the joining surface; a plurality of first chamber inlets defined through and extending into the first chamber, the first chamber having a first space with a first radius and each of the first chamber inlets configured to input a first fluid of a first temperature into the first space at a first pressure; a plurality of first chamber outlets defined through and extending into the first chamber, the plurality of first chamber outlets defined to remove the first fluid; a plurality of second chamber inlets defined through and extending into the second chamber having a second space with a second radius, the second radius being less than the first radius and the joining surface defined to provide a support edge for the substrate when present, the first space and the second space being joined at the joining surface, wherein each of the second chamber inlets is configured to input a second fluid of a second temperature into the second space at a second pressure, wherein the first fluid does not intermingle with the second fluid when the substrate is on the support edge; and a plurality of second chamber outlets defined through and extending into the second chamber, the plurality of second chamber outlets defined to remove the second fluid; wherein the first pressure and the second pressure are substantially equal.