Hey all,5 cats, six litter boxes. I clean them but sometimes the STANK of cat butt lingers. These boxes are in the garage-converted-to-living-space ('the den'), which shares open air with the furnace.There is an air intake above the furnace that vents into the boiler room and den.I am contemplating putting a cat door onto the door to the den and leaving it closed. That will only concentrate the stank in that room, however.I would like to put an exterior wall mounted fan in the den that exhausts outwards. This would draw air from the air intake and pull it through the den and out of the house. This room is unheated so that's not a huge issue.Would this setup draw carbon monoxide from the furnace into the den and make it unsafe? or would it reduce the CO by increasing overall air flow? Trying real hard to not poison myself, my wife, or my cats, here. via /r/DIY http://bit.ly/2QfJuvq
