Patent ID: 7935185

Claim:
A film forming system comprising: a heat treatment furnace adapted to perform a film formation process and including a vertical heat processing vessel and a heater arranged around the processing vessel, the processing vessel being adapted to be evacuated and adapted to accommodate a plurality of process objects therein; a support boat adapted to support the plurality of process objects at vertical intervals; a boat elevating mechanism adapted to move the support boat vertically to allow the support boat to be loaded into and unloaded from the processing vessel; a standby space, arranged below the heat treatment furnace, where the process objects are carried into and removed from the support boat located below the processing vessel; a clean gas circulation system configured to generate a circulation flow of a clean gas which passes unidirectionally through the standby space at a flow velocity, the clean gas circulation system including a flow path and a fan for generating the circulation flow, the flow path having a first end opening into the standby space to allow circulation flow inflow the standby space and a second end opening into the standby space to allow circulation flow outflow the standby space; a clean gas jetting system including a gas line branched from the flow path and a clean as jetting nozzle having gas jetting holes opening into the standby space at a location different from where the first end of the flow path opens into the standby space, the clean gas jetting system being configured to collect a part of the clean gas, configured to pressurize the clean gas thus corrected, configured to supply the clean gas thus pressurized to the clean gas jetting nozzle through the gas line, and configured to jet the clean gas thus supplied to the clean gas jetting nozzle toward the support boat, which is located in the standby space without carrying the process objects, at a jetting velocity higher than the flow velocity, from the clean gas jetting nozzle extending along a height direction of the support boat.