eavy metal grate protection pavement used for ventilation underground spaces |
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| navigate by keyword : air city covering drain drainage duct equipment floor flooring footpath galvanized grate grated gratings grid grill grille grilles ground grounds industrial industry iron material metal metallic orsogril pavement pedestrian people plate protection road safety security sewage sewer sidewalk steel stone street style subway underground urban ventilation walkway |
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| EAVY METAL GRATE PROTECTION PAVEMENT USED FOR VENTILATION OF UNDERGROUND SPACES - Ventilation iron grid on urban area with a person walking |
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