The past years has witnessed steadily gowning development of Nanjing Blue Sky Filter Co.,Ltd. for its hvac filters. Blue Sky produces a number of different product series, including vacuum cleaner extension pipe. Blue Sky spare parts for vacuum cleaner is required to go through several performance tests. They are water washability, breathability, impact resistance, tearing strength, and rub colorfastness testing. Blue Sky has a complete set of product quality assurance system.

we has been in v-cell air filters industry for many years and always been praised for its good service. Ask online!