Cooker Hood Grease Filters 5 "Not as Expensive as they seem" Lilian 20 July 2016 I bought another 2 packs today. My cooker hood is vented so I only need the grease filter. I have to cut to size but I only use 1/4 of one filter and there are 2 in the packet. Why do I buy 2? I always worry they will discontinue and they don't take much space. They work well too.