Universal 120 x 50 cm, cut to size cooker hood / kitchen fan extractor grease filter, sufficient for 2 filter changes, grease filter fits 99% of cooker hoods. Cooker hood grease filter should be replaced every 6 months for better efficiency and electricity saving. Far better than the paper ones, you can convert using this superior filter. Fits Acorn, Elica, Xpelair, etc and most cooker hood makes. 
Should be changed every 6 months or sooner if cooking greasy foods for efficient extraction of fumes.