above angle angles appearance building corrugated corrugations exhaust pipes grooved grooves height high metal perspectives protection roof roofing rooftop safety security shadows shapes shopping centre shops sunlight ventilation exhaust pipes ventilation system chrome tube exhale exhaust pipe motor pipe power racing sports steel tractor tractor pulling weights capping cover covered covering edge exhaust-pipes exterior external roof-area roof-capping roof-whirlybird sky sunshine textures tiles tiling turbine-ventilator vent ventilation ventilation-exhaust-pipes ventilation-system ventilator vents whirlybird whirlybirds wind-turbine air air condition architecture chimney climate conditioning duct ducts electronics exhaust factory industrial industry iron technology tube big conduit hydraulic line large line metallic pipeline pipework piping shining silver tubes tubing brick bricks emission emissions nature pollute pollution production red smog smoke smokeshaft tall trees exhaust pipe industrial smokestack smokestack