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门窗-门窗即门与窗。门窗按其所处的位置不同分为围护构件或分隔构件，有不同的设计要求要分别具有保温、隔热、隔声、防水、防火等功能，新的要求节能，寒冷地区由门窗缝隙而损失的热量，占全部采暖耗热量的25%左右。门-menchuang</br> generated by yvsou girl
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(28.56701.236.7261.7283.7380)
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(28.56701.236.7261.7283.7380)