The small end will need to fit snugly in the hole, maybe you could screw it to the sides though it will be annoying to use a screwdriver inside the hole. Even though the venting through the window seems complex it is going to be way simpler than the above described manifold system! If it has problems with the 3" size an inline blower or a duct booster could be added many of these are tempature controlled and that would increase the flow through the hole but I would give it a try. If you use an in duct exhaust fan that has a higher cfm than the portable ac, it will negate the constriction caused by downsizing the exhaust from 6" to 3". This is not particularly dangerous, but it is annoying and can decrease the lifespan of your AC unit.

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How To Vent A Portable Air Conditioner With Window If the room has a fireplace or chimney, this can be used as an alternate method for how to vent a portable air conditioner without a window.

Universal Adapter: Fits both clockwise and counterclockwise exhaust hoses no matter the thread direction, making it suitable for most portable air conditioners on the market.At the end of the day, I'm pretty sure that having its exaust capaciry so restricted overheated the unit and it triggers the AC off. It only runs for about 3 or 4 weeks during the summer and that's it Only a few hours a day during those weeks. You must use a roof window caulking kit (Velux) which is neither aesthetic nor practical to install. So if the length of the 3" diameter hole is short compared to the length of the 6" hose, then the constriction to 3" may work OK.

However, the hoses get extremely hot (my laser thermometer put them at a little over 120° F) and the adhesive in the tape melted and the hoses kept coming off. I think that you should try to see if this will work through one hole before you resort to rigging up something in the window.

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I needed to vent through the wall because you can’t keep casement windows open and the window kits aren’t made for casement windows.The 4" x 4m hose enables connection from the inside of the wall vent to your appliance and is bundled with a 5" to 4" reducer and 6" to 4" reducer to ensure a secure fit to your 5" or 6" air conditioner vent hose outlet if needed. Measure the length of the portable AC’s exhaust hose: Use a measuring tape to measure both the diameter and length of your portable AC’s exhaust hose before selecting a cover for itConnecting a large AC exhaust hose to a dryer vent will make the AC work harder to remove heat from your room. Clearly the A/C unit was designed to work with 6" hoses and thus the reason I do not recommend that you do what you are suggesting. Simply open the window and adjust the length so that the vent kit fits between the sliding window and the window frame. To enable personalised advertising (like interest-based ads), we may share your data with our marketing and advertising partners using cookies and other technologies.