这是供暖、通风和空调风门的应用手册。如果您指定了暖风、通风与空调系统（HVAC）风门，本手册将为您提供指南，帮助您了解各种类型的风门，以及正确使用风门时需要考虑的事项。不包括防火阀、隔热阀和防烟阀。

This is an application manual for heating, ventilation and air conditioning dampers. If you specify HVAC dampers, the manual is a guide to understanding the various types of dampers available and items to be considered for their proper use. Dampers classified as fire dampers, heat dampers and smoke dampers are not included.