I was using two range hood filters for the ventilation fan, but please check the size as ventilation fans vary in size depending on the household. The size of one range hood filter is shown in the image. Due to the size of the package, returns are not accepted. I cannot provide the receipt from the purchase because it contains my name and address. The instruction manual (in the image) will be included. I purchased it for 36,000 yen. There are a total of [number] sheets. 23 sheets + 24 sheets = 47 sheets One sheet has been used. The seal is unbroken and I haven't taken anything out, but please do not expect perfection.