5.1 inche door

So I got a B&D portable A/C and I love it, except for the fact that the exhaust mount was the cheapest piece of crap I've ever had. The hose broke after the first install and the baffle itself just broke randomly one day for no reason at all while nobody was even touching it. This mount not only went together easier, but it seems more durable and fit the window better overall. Only wish I had bought it initially instead of trying to work with OEM one and raising my blood pressure.

This little thing gives me a lot of peace of mind. The build is the highest quality and strength. Even has a built in level to be certain it is installed well. This kit can be use with 2, 3 or 4 panels can be adjusted from 17” to 61” depending on your window size, can also be use horizontally or vertically whichever is better for you. The kit includes 2 Outer Plates, 2 Inner Plates, Exhaust Hose Adaptor, 2 Sealing Tapes and 5 Butterfly Screws. Easy to install and solid quality. I bought this kit for one my portable A/C. Very easy to install, makes AC work the most efficient, great support. Holds up very well. Easy to place in window. Would recommend. I'm very happy and wouldn't ever do without one.

Bought the version for a 5.9 inch diameter exhaust hose. It's just slightly wider than the hose itself, so I had to cut a piece of wood to slide into the deep jamb on my patio. Because of that my one complaint is that since it's around half a foot wide and you can't slide it into the jamb thanks to there being no adapter to make a smaller hole like on the 5.1 inch version, there's a chance someone could push it in and slide themselves inside if they're skinny enough, even if you have the door locked in it's tracks. But I only got it so I could hook my portable AC up in the living room on hot days so I'd take it down when I'm not there anyways

This item worked great on my very tall window that open horizontally. It was easy to install to use for the summer and then easy to take down and store for the winter.

This works great if you purchase 2 of the exact product to make it very sturdy. 1 set just wasn't sturdy enough for me so I bought two and put them together now, I have a great product.

This device is at best a temporary fix to hold you over, until either summer ends or you install a proper AC exhaust through your wall. It's flimsy and shows a lot of gaps. The tape that comes with it is a joke and doesn't stick (I wonder if the 3M people know their brand name got appropriated by someone). Definitely not worth upwards of $30 (plus another few dollars in duct tape).

We got this to go in our sliding door, so we could put our free standing portable AC there. The weather stripping peeled off, the unit itself had to be gorilla taped into the frame because it didn't stay in place, and there's a small gap where bugs can get in.

Got this window kit as a replacement. The hose adapter fits perfectly with my existing hose. The hose adapter snaps on into the window plate and is connected firmly so it won't snap off easily. What I like about this window kit is that the hose adapter snaps into the window plates rather than using groves/notches to lock into place which can easily break. Everything came in the box with no missing items.