Ventilation ducts are divided into three types: integral ordinary ducts, integral insulation ducts, and combined insulation ducts. Ventilation ducts are not suitable for exhaust ducts in residential buildings. Based on the physical and mechanical properties and appearance quality of the ventilation duct, the size of the ventilation duct should be designed by the design unit according to the ventilation volume required by the project, or it can be designed and produced according to the specific requirements of the project. The shape of ventilation ducts can be divided into two sections: circular and rectangular. Before installing fiberglass ventilation ducts, debris inside and outside the pipes should be removed, and cleaning and protection work should be done well; The installation location, elevation, and direction should be in accordance with the ventilation engineering design requirements. The configuration of on-site air duct interfaces shall not reduce their effective cross-section; The bolts connecting the pipeline flanges should be tightened evenly, and the nuts should be on the same side; The connection of the air duct interface should be tight and firm. The gasket material of the ventilation pipe flange should meet the requirements of the system function, and the thickness should not be less than 3mm. The gasket should not protrude into the pipe, nor should it protrude from the outside of the flange;