GUYS. IF YOU HAVE CONCERNS ABOUT SMELLS,THEN THESE BEAUTIES ARE THE SOLUTION. CARBON FILTERS ARE OK BUT REQUIRE POWERFUL FANS TO USE THEM. I WAS GIVEN THESE BY A FRIEND YRS AGO AND I PLACE THEM IN THE EXTRACTOR VENT AND CANNOT SMELL ANY WEED WHATSOEVER. THEY ARE DISC SHAPED AND ITS ADVISABLE TO HANDLE THEM WITH GLOVES AS THE SMELL STICKS LIKE SHIT TO A BLANKET! THEY LAST FOR WEEKS AND ONLY COST £0.89 IN B&M STORES. 6 IN A PACK. TRY THEM AND YOU WONT REGRET IT.
