Portable AC Window Seal Kit for Casement & Crank Windows, 300CM/118" No-Drill Window Vent Kit, Adjustable Zipper Seal for Single & Dual Hose Portable Air Conditioners, Waterproof AC Window Kit
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Availability:
Only 10 left in stock, order soon!
Arrives
Monday, Nov 2
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At a glance
- Condition
- New
- Size
- 118 in
- Model
- 3M
- Dimensions
- 1 x 1 x 1 in
- Weight
- 7.8 oz
Features 5
- Fits Casement, Crank & Skylight Windows:Designed for casement, crank-out, push-out and skylight windows, this portable AC window seal kit fits window perimeters up to 300CM/118". A practical solution for homes and apartments where standard sliding window kits do not fit.
- Works with Single & Dual Hose Portable AC Units:The adjustable zipper opening wraps around one or two exhaust hoses, making it easier to vent different portable air conditioner setups. It offers more flexibility than rigid window panels with fixed hose ports.
- Helps Reduce Hot Air Backflow:By sealing the open window area around the exhaust hose, this AC window vent kit helps reduce warm outdoor air from flowing back inside. It supports more efficient cooling and helps keep your room more comfortable in summer.
- No-Drill Installation for Renters:No tools or drilling needed. Apply the adhesive hook tape to a clean, dry window frame, attach the seal, place the hose through the zipper opening, and tighten around it. Great for renters and seasonal use.
- Water-Resistant Fabric for Summer Use:Made with durable water-resistant fabric for everyday summer use. The flexible design helps create a neater setup than cardboard or tape DIY solutions and is easy to remove and store when the season ends.
Description
Will this fit my casement or crank-out window? Yes. It is designed for casement, crank-out, push-out, skylight and other non-sliding windows. Please measure your window before ordering. How do I choose between the 300CM and 400CM size? Measure the total perimeter of your window frame. Choose 300CM for up to 118", and 400CM for up to 157". Pick the closest larger size. Can it work with single hose and dual hose portable AC units? Yes. The adjustable zipper opening works with both single and dual hose portable air conditioners, as well as many dehumidifiers and tumble dryers. Do I need tools or drilling to install it? No tools or drilling required. Clean the frame, apply the hook tape, attach the seal, place the hose through the zipper, and close it around the hose. Does it help keep hot air from coming back inside? Yes. It helps seal the open window area around the exhaust hose, reducing hot air backflow and supporting more efficient summer cooling.
Specs 3
| Product Dimensions | 1 x 1 x 1 inches |
|---|---|
| Item Weight | 7.8 ounces |
| Item model number | 3M |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Nov 2
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Does exactly what it’s supposed to would recommend!
Size: 118 inch
We just moved into a new place that has crank open windows and I must say I am satisfied with the quality durability and sturdiness of this product! The adhesive that they supply with it worse very good and the price was well worth it as well! It fit just like it should although I highly recommend you double and triple check your measurements! I would recommend this to my friends for sure
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Reviewed in the United States on August 17, 2026 by Terry komyanik
Works Perfectly For Crank Out Window
Size: 118 inch
Works perfectly for my older swing out window. I don't have central air and my room is upstairs so it gets pretty hot in the summer, too hot for just fans. I'd given up on using a portable AC because of the difficulty sealing off this type of window but this seal did exactly what I needed it to do. I highly recommend this kit!
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Reviewed in the United States on July 2, 2026 by Samm_Tot
Works great, as long as it is not too windy
This is my second magnetic screen door, but first thermal. Placed over my sliding door to access the rear deck. It's a bit long for the spot (1-2 inches) so it doesn't always close securely, but that is not a fault of the product, and only a minor inconvenience as a little toe kick will usually get the magnets to connect. It seems to insulate well and is of sturdy construction. My only issue is when it is windy. Because this is a solid piece of plastic, wind will easily get behind and pull the magnets apart rendering it useless as a barrier. Additionally, the magnets bang against the door and frame as they flap in the wind. I wouldn't mind if this happened only in heavy winds, but it doesn't take much at all. I like the idea of this product and given the right place to install, I would certainly purchase another. However, for my personal situation, the mesh version works better and I'll be going back to it once this one wears out. I may attempt to add some small counter weights at the bottom to see if it would help.
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Reviewed in the United States on May 5, 2019 by Chad
A godsend for apartments with weird windows
Size: 157 inch
This literally makes it possible for me to run an AC in my weird apartment. Dunno what I'd do without it. I'm cozy now thanks to this thing.
Reviewed in the United States on August 15, 2026 by Aaron
Works!
Size: 157 inch
Not easy to figure out how to use an ac unit in a window like this! We have an old house so these crank completely out. So both sides need to be sealed. It wasn’t difficult to install, just use the adhesive to apply all around the window frame and then velcro the plastic pieces together. It doesn’t look the most attractive from the outside but it’s better than dying of heat! There’s normally No leakage but if there is a heavy rain, the way it seals together on the top of the window creates a pocket… so it will start to get filled with water and can leak down the sides a bit. How to solve that is to raise it up making a pitch in the plastic so it drains off the sides so it won’t collect there. The zipper opens large enough to attach the hose through. It really is the best solution for this weird type of window. Ok, the only one! Haha
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Reviewed in the United States on October 14, 2025 by TrueJack
Glue melts in sun - not a good seal
Size: 157 inch
the velcro strips got unglued as the window was in the full sun. Resorted to duct tape to stop the daily gapping. Too late to return. Bought Martinson's plexiglass insert - expensive but does the trick
Reviewed in the United States on August 21, 2026 by Stamford, CT
Good product
Size: 118 inch
Got the wrong size but it still works for us so no need to return! Thanks
Reviewed in the United States on July 20, 2026 by Feride
Updated: Downgrade from 4 stars to 1 - quality/longevity is horrific.
2nd Update after 2 months of use - Downgraded from 4 stars to 1. The quality of these things are pathetic. I have it in a high use area but we literally just walk through it - no running, pushing big objects through it, etc. - and it has ripped a TON! There are holes scattered throughout the plastic and the side ripped where it attached to the Velcro in about a 2 foot section. The one we have in a less high traffic area has the holes, too, but hasn't ripped YET (I haven't had it quite as long so I am not holding my breath). I had to tape it up and now it looks terrible. I would expect these to last longer than a couple of months. They work for awhile but simply don't hold up. It's a shame, too, because as you can see below I loved the product so much at first I bought a 2nd one! Update - I actually am so happy with this product I bought a 2nd one. Too much cool airneas escaping from our bedroom when we propped the door open each night for our cat. Unfortunately if we don't leave it open she will scream at the door all night to have access so this is the perfect solution! Only drawback is sometimes she gets fiesty and runs full speed into the one we currently have and it is quite loud! Hopefully she won't this time but something to be aware of if you have pets. I am actually surprised at how efficient this thing is. I was afraid it would be so-so but it works pretty well. The Velcro used to hold it to the door frame is pretty strong and the magnets that hold the opening together are, too. Only reasons it didn't get 5 stars are: I got the clear one and it has this horrible, old looking lace detail along the top. I genuinely don't understand why. It wasn't mentioned in the product description that I could find and it is in the photo, but not very noticeable (especially on a mobile phone). It doesn't make the product less effective, just ugly. Second, the Velcro around the door frame peeled off in a section. We got it back up, but it didn't stick well at first. Third, it's SO LOUD. I suppose it makes sense, but when you are taking it down or putting it back up and adjusting, the noise is crazy loud. I wouldn't have even really paid attention to this previously, but I have a newborn who was woken up from a nap by it when my husband put it up one day.
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Reviewed in the United States on June 18, 2018 by Caleh100