店名：宣意门窗 地址：福州鼓楼区五四路323号（安华苑一楼店面） 环境/商品：店里摆放了很多玻璃门窗、铝合金门窗、淋浴房门等，种类很多。售卖不锈钢门、淋浴房门、防盗门、纱窗、铝合金推拉门等，款式很多。还能根据需要，私人订制，送货上门安装。

Air tightness performance: under the action of wind pressure and thermal pressure, air tightness is an important control index to ensure the stability of thermal insulation performance of building external Windows. The air tightness performance of external Windows is directly related to the infiltration heat loss of cold air of external Windows. The higher the air tightness level is, the smaller the heat loss is.