美国环境保护署报告说，对风管清洗是否必要的研究仍处于早期阶段. It’s believed that most dirt in air ducts sticks to the ducts’ interior surfaces and doesn’t enter the living space. The agency does suggest having air ducts cleaned if there’s visible mold growth inside hard ducts or on other HVAC components, 如果管道里有害虫, or if they’re clogged with excessive 灰尘 and you notice it being discharged into your home. 一些暖通空调专家建议每三到五年清洗一次风管, 特别是如果家里有人有呼吸系统问题. If your home’s air ducts are old, dirty, or damaged, it might be best to have them replaced.