!A Note on Winter Air Quality! - Well, it is that half of the year again, when we all have to close our windows due to the cold. This can reduce air quality inside the house, which can be an issue for our birdies, especially if there are several cages in a room, doubly so if you have cockatiels or cockatoos. During the warm months I have 4 8-inch duct fans installed in a couple of windows each moving 750+ cfm of fresh air through the aviaries and nursery. But now I am down to just 1 fan, and air quality is a concern. If any of you have ever bred cockatiels or linnies, you know how stinky they can get when the hormones kick in, and all that feather dust in the air is not fit for man nor beast. To solve this I installed 4 of these air filtration units, purchased from a hydroponic cannabis distributer. Basically they are light weight 8 inch inline 720cfm duct fans on top of a stainless steel container holding 20+ lbs of charcoal wrapped in a pre-filter. The difference they make is amazing, walking into a room with one of these running and you can smell the air, it smells just like water tastes if that makes any sense. Walking out of room after spending some time inside, you are hit with all the house smells you have previously gone nose-blind to. The pre-filters work very well too, every few days I can peel off a layer of feathers and feather dust, like a dryer lint trap. At 720cfm they can cycle the air in a room every 2 to 6 minutes, depending on size. On the down side, they are a bit noisy, and are not very nice to look at. I have tried many different air filters such as the bionaire and honeywells, and while they may be enough for a small room and one or two birdies, these big units pack such a larger punch at a lower price. They come in sizes ranging from 4inch to 8inch, if anyone is interested just search "inline duct fan with odor control" on amazon. I strongly recommend some sort of air filtration to control odors, keep alergies under control, and prevent sensitivities or respiratory problems in people and birds (have you seen your birdie sneezing a lot lately?).