ventilator above angles appearance building capping cover covered covering edge exhaust-pipes exterior external grooved grooves height high roof roof-area roof-capping roof-whirlybird roofing rooftop shapes sky sunlight sunshine textures tiles tiling turbine-ventilator vent ventilation ventilation-exhaust-pipes ventilation-system vents whirlybird whirlybirds wind-turbine architectural attached attachments colored colors coloured colours dark edges edging elements light lines perspectives protection protective ridges rows shadows surface surfaces antenna communication concave dish electrical-signals electromagnetic feedhorn parabolic parabolic-reflector radio-waves round satellite-dish technology television ventilate air air condition airation clima cool hot support vending vending machine ventilation system