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　　The expansion and contraction of heat has certain damage to the air duct. Today, let's talk about how the spiral air duct should face this trouble in the cold area in the north or in winter.

　　首先對于保溫材料的選擇，要選擇保溫性能好的，保溫材料的規格應符合風管系統所使用的，還應當符合風管的設計要求，使用的保溫材料要有合格證等質量合格證件，以保證使用時能有效的保護風管，使其在冬天使用時不易損壞。潔凈風管一般選擇難燃閉孔橡塑海綿保溫材料，排煙風管一般采用不燃的鋁箔玻璃棉板。這兩種材料使用比較普遍，保溫性能比較好。

　　First of all, for the selection of thermal insulation materials, the ones with good thermal insulation performance shall be selected, and the specifications of thermal insulation materials shall meet the requirements of the air duct system, as well as the design requirements of the air duct. The thermal insulation materials used shall have quality certificates such as certificates to ensure that the air duct can be effectively protected in use, so that it is not easy to be damaged in winter. The clean air duct is generally made of fire-resistant closed cell rubber plastic sponge insulation material, and the smoke exhaust air duct is generally made of non combustible aluminum foil glass wool board. These two materials are widely used and have good heat preservation performance.

　　其次使用保溫材料包裹螺旋風管時，切割時，下料要準確，切割面盡量要平齊，這樣粘接時才能確保粘接緊密，切料時，要使水平垂直面搭接處以短面兩頭頂在大梁上。

　　Secondly, when wrapping the spiral air duct with thermal insulation materials, the cutting shall be accurate, and the cutting surface shall be as flat as possible, so as to ensure the tight bonding. When cutting, the short ends of the overlapping part of the horizontal and vertical surfaces shall be placed on the girder.

　　在用保溫材料包裹螺旋風管前涂膠時，膠的厚度要均勻，還有涂膠時不能有膠流淌，對保溫材料進行鋪覆時，這樣才能有效的保證粘接時粘接的地方粘接緊密了。粘接的地方才不會有空鼓出現，也不會有裸露在外面的風管。

　　Finally, when the insulation material is used to wrap the spiral air duct, the thickness of the adhesive shall be uniform, and there shall be no glue flowing when the adhesive is applied. When the insulation material is laid, it can effectively ensure that the bonding place is tightly bonded during the bonding. There will be no hollowing in the bonding area and no exposed air duct.