Activated carbon box without fan

Please checkout v2An activated carbon with minimum affect to air flow and don't require fan.Don't put too much activated carbon inside, it need space for air flow.This box has OD 88mm, compatiable with 90mm~100mm vent hole.How it worksEach slot in honeycomb have activated carbon and open hole for air go though, then activated carbon will absorb VOCs which touch them.