小猫我做了一点调查， 最好的空调过滤网应该是

(1) 3M Filtrete MPR 2800 

https://www.amazon.com/gp/product/B00TUDHIEY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1?

(2) 3M Filtrete MPR 2200也不错，曾经见过Costco有卖

https://www.amazon.com/Filtrete-Healthy-Allergen-Reduction-Furnace/dp/B005F5D5WK/ref=pd_cp_60_3?_encoding=UTF8&psc=1&refRID=HX5J641DD7HHX689XP9P