The Pre-Shipment Inspection (PSI) is one of many types of quality control inspections conducted by Nanjing Blue Sky Filter Co.,Ltd.. This inspection is done according to standard QC Test, or based upon customer requirements. Samples are selected and inspected for defects at random, according to these standards and procedures. For us, Pre-Shipment Inspection is an important step in the quality control process and is the method for checking the quality of air purification filters before they are shipped.

Blue Sky has gained years of expertise in the developing, designing, and manufacturing of spare parts for vacuum cleaner. We enjoy a good reputation in the industry. According to the material, Blue Sky's products are divided into several categories, and hepa filters is one of them. The product has good quality and reliable performance. With highly unlikely electricity price falling down in the future, it is recommended for people to choose this energy-efficient product.

We stick to sustainable activities in our daily operation. By adopting socially responsible norms early on, we aim to set the bar for our industry and refine our process.