加拿大采购需求：NANPU Z系列空气过滤，三级空气净化系统，工业用烧结过滤器，精细空气过滤器供应商，B2B活性炭过滤器，工业空气过滤解决方案

I'm interested in purchasing a specific 3-stage air filtration system that includes sintered, fine, and charcoal filters. Could you please let me know the most reliable sources for acquiring replacement filters in the future? Additionally, it would be helpful to understand if there are any authorized distributors or retailers in Canada that stock these filters. This information would be vital for ensuring the system remains operational over time. Thanks!