The material was pure white before I cut it and taped it to my oven/AC vents. I would put them in like my sister does at home; but I'm on loan and the screws and frame have been painted over so many times that I was concerned removing the vents would mess up the textured walls. The vents are creamy white and after a while I didn't even think they were on the vents. This is a picture of how black they turned on the bottom walls of the cold air recirculation vents after 3 months - I have severe environmental and animal allergies and in this building almost every room has a dog or cat. I was hoping these filters would help, along with installing and replacing my own higher quality HEPA/allergenic filters in the oven. The owners of this complex force our maintenance staff to only change the air conditioning/furnace filters in the units twice a year (these are the lowest quality 'special' filters you can get. I buy my own and change them every two Months - sometimes they lasted 3 months but they get as dirty as the air vent filters, although I still sneeze and my nose still runs, at least it's not as bad as before.
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