关于天窗的通风，景观和灯光天窗有多种形式，从廉价的塑料圆顶到可操作的屋顶窗户，这些屋顶窗户可以兼顾屋顶紧急出口。即使是最基本的天窗也将日光接收到室内空间中，否则必须用电光照亮。开放和关闭的天窗具有从上层故事室中排出闷气的额外优势。根据它们的放置方式，天窗还可以提供户外风景。塑料和各种玻璃都用于天窗玻璃。塑料（通常是丙烯酸或聚碳酸酯）的成本低于玻璃，但对刮擦的耐药性不佳，在长时间暴露于阳光之后，它可能会变得脆弱且变色。聚碳酸酯具有较高的抗抗性能力，并且比丙烯酸更昂贵。塑料天窗以各种形状（圆顶，矩形，圆形，椭圆形和三角形）制造，这些形状很难用玻璃复制。更昂贵的天窗是用玻璃制成的，现在制造商提供了各种各样的玻璃选择。这对于为特定屋顶的位置或特定气候区域选择天窗很有用。 Skylights are manufactured by many companies, although there are only a few national players. The residential market for off-the-shelf skylights is dominated by Velux, a Danish company. Maine-based Wasco claims a distant second place. Other manufacturers, such as Tam, Columbia,and Sun-Tek, are stronger regional forces. Fakro, is a major European manufacturer but it hasn’t made serious inroads in the U.S. to date. Three major window manufacturers ( Andersen, Marvin and Pella) have dropped out of the skylight business in recent years as the industry consolidated. In addition to mass-marketed residential skylights, there’s also a booming trade in high-end custom skylights for residential as well as commercial buildings. Wasco considers itself the leader in that field. Matching…