You're essentially going to be making a home-made version of a through-wall dryer exhaust vent. I had to compress the foam some with the palm of my hand to get it to fit in the window track, but it's going to make a really tight seal against the cold NYC winters as a result! I also found that the seal with the window was improved by using the tongue side of the tongue-and groove as the top edge of the window insert. Test the fit of the foam in the window and trim accordingly. Be sure to support the material as you cut, as it cracks somewhat easily. Use a large, serrated knife to cut the rectangle from the stock. Use a straight edge to mark a rectangle 8" by the width of your window frame. Use a tape measure to to get the inside dimensions of the track that your lower double-hung window slides in. Another bonus is that it provides insulation comparable or better than window glass. The pink insulation could probably be painted with acrylic wall paint to improve appearance. I bought a whole sheet of it for pretty cheap at a Home Depot in the Bronx and cut it down some using a handsaw in the store to allow me to get it on public transit. 10 hot glue sticks * 5-25' (location dependent) of 4" dryer duct, aluminum or plastic * electrical tape * 2 x 16" long zip ties * 2 small zip ties * 8" x 36" rectangle of Owens-Corning Foamular(R) 250 or comparable (pink foundation insulation) or 3/4" plywood (if you have a jigsaw or sawzall).īecause most apartment dwellers don't have ready access to electric saws, I opted to use 1" thick Owens-Corning pink foundation insulation: it can be easily cut with a serrated bread knife. * 2 x plastic food storage containers (25oz, 740ml - 6-3/4" x 6-3/4" x 2-1/4") with lids * 2 x empty, de-labeled 28oz food cans (I used cans from crushed tomatoes) with both ends removed. Perfect for apartment dwellers! Required Tools * Hot glue gun and roughly 10 hot glue sticks * Heavy duty poultry shears or tin snips * Serrated bread knife * Serrated tomato knife * Electric drill * Standard drill bit index (up to 1/2") * Permanent marker Required Materials * Hooded plastic cat litter box with at least 7"x7" of flat surface on the back end * 12V 120mm CPU fan (smaller sizes may also y recycling one from an old desktop computer). It is also quite doable for someone with limited tools. This project is designed to cost less than $35 to make, and uses mostly common, recycled and/or re-purposed and cheap materials. I will be following up this post with another version that couples to a bathroom exhaust vent. probably not on the ground floor in a neighborhood like mine!). This design is intended for those who are willing to keep the litter box near a single-hung window with outer screening and no burglary concerns (i.e. Your cats will probably even forgive you for not scooping as often. If you are a cat owner, this DIY catbox ventilation system will dramatically improve the quality of your life, restore your fraying friendships, and amuse guests with your ingenuity. Worse, many cat owners gradually acclimate to the odor, creating an awkward situation for house guests.
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