PROBLEM TO BE SOLVED: To provide a filter provided with activated carbon capable of efficiently adsorbing contaminants contained in indoor air of a building.SOLUTION: A filter comprises a first filter, a second filter provided on the windward side of the first filter, and a third filter provided on the leeward side of the first filter, and a frame body fixing the first to third filters. The first filter includes a lattice member fixed to the inside of the frame body and dividing a space, formed inside the frame body to allow indoor air to pass therethrough, into a lattice shape, and first activated carbon fixed to the lattice member and adsorbing contaminants contained in the indoor air. The second filter includes a nonwoven fabric through which the indoor air passes and second activated carbon held by the nonwoven fabric and adsorbing the contaminants contained in the indoor air. The surface area of the second activated carbon contacting with the indoor air is larger than that of the first activated carbon, and the weight of the first activated carbon is larger than that of the second activated carbon.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】建物の室内空気に含まれる汚染物質を効率よく吸着することができる活性炭を備えるフィルタを提供する。【解決手段】第1フィルタと、第1フィルタの風上側に設けた第2フィルタと、風下側に設けた第3フィルタと、第1~第3のフィルタを固定する枠体と、を備えるフィルタであって、第1フィルタは、枠体の内側に固定されるとともに、枠体の内側に形成された室内空気が通過する空間を格子状に区分する格子部材と、格子部材に固定されて、室内空気中に含まれる汚染物質を吸着する第1活性炭と、を備え、第2フィルタは、室内空気が通過する不織布と、不織布に保持されて、室内空気中に含まれる汚染物質を吸着する第2活性炭と、を備え、第2活性炭が室内空気に接触する表面積は、第1活性炭における表面積より大きく、第1活性炭の重量は、第2活性炭の重量より大きい。【選択図】図4
