| CPC H01L 21/67023 (2013.01) [H01L 21/673 (2013.01)] | 27 Claims |

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1. A substrate treating apparatus comprising:
a first treating housing for treating substrates in an interior thereof; and
a first gas supply unit for supplying a gas to the interior of the first treating housing;
wherein the first gas supply unit includes:
a filter disposed in an upper part of the first treating housing for blowing off the gas to the interior of the first treating housing;
a duct disposed in an exterior of the first treating housing and connected to the filter; and
a fan disposed in the exterior of the first treating housing and connected to the duct;
the fan being located in a position not overlapping the filter in plan view;
at least part of the fan being located in a same height position as the first treating housing.
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