bc菠菜论坛的使用寿命在不同的情况下会有很大的不同. 如果你的bc菠菜论坛安装正确, hasn’t been excessively exposed to corrosive elements, 从高质量零件开始, 多年来一直在保养, it could conceivably last as long as 20 or 25 years before you absolutely need to replace it — but even in those circumstances, you’d see a loss in performance starting after its first decade. 如果没有这些极好的条件, your ductwork’s more likely to need replacement at 15 or even 10 years from its initial installation if you want to maintain a high degree of performance and 效率.