An electronic equipment enclosure comprising: a housing including a first vertical extending side, a second vertical extending side opposing the first vertical extending side, an upper portion, and a bottom portion opposing the upper portion, the housing configured to hold electronic equipment between the opposing vertical extending sides; a first vent opening defined in the electronic equipment enclosure and located in the bottom portion of the housing , the first vent opening configured to allow air to flow into or out of the electronic equipment enclosure ; a second vent opening defined in the electronic equipment enclosure to create an airflow path between the second vent opening and the first vent opening ; at least one fan positioned within the housing and configured to move air within the housing from the second vent opening to the first vent opening ; a first plurality of vanes arranged in a first row and disposed within the electronic equipment enclosure adjacent the first vent opening , one or more of the first plurality of vanes disposed directly under the electronic equipment when the electronic equipment is between the opposing vertical extending sides; and a second plurality of vanes arranged in a second row positioned above the first row, the first row offset with respect to the second row to block a straight path from the first vent opening into the electronic equipment enclosure past the vanes ; wherein one of the vanes of the first row is adjacent the first vertical extending side of the housing and one of the vanes of the second row is adjacent the second vertical extending side of the housing ; wherein the first plurality of vanes and the second plurality of vanes are configured to inhibit at least some unwanted materials carried by air entering the first vent opening from passing when the at least one fan is not operating. a housing including a first vertical extending side, a second vertical extending side opposing the first vertical extending side, an upper portion, and a bottom portion opposing the upper portion, the housing configured to hold electronic equipment between the opposing vertical extending sides; a first vent opening defined in the electronic equipment enclosure and located in the bottom portion of the housing , the first vent opening configured to allow air to flow into or out of the electronic equipment enclosure ; a second vent opening defined in the electronic equipment enclosure to create an airflow path between the second vent opening and the first vent opening ; at least one fan positioned within the housing and configured to move air within the housing from the second vent opening to the first vent opening ; a first plurality of vanes arranged in a first row and disposed within the electronic equipment enclosure adjacent the first vent opening , one or more of the first plurality of vanes disposed directly under the electronic equipment when the electronic equipment is between the opposing vertical extending sides; and a second plurality of vanes arranged in a second row positioned above the first row, the first row offset with respect to the second row to block a straight path from the first vent opening into the electronic equipment enclosure past the vanes ; wherein one of the vanes of the first row is adjacent the first vertical extending side of the housing and one of the vanes of the second row is adjacent the second vertical extending side of the housing ; wherein the first plurality of vanes and the second plurality of vanes are configured to inhibit at least some unwanted materials carried by air entering the first vent opening from passing when the at least one fan is not operating. <EOS>