How about two single-glazed sliders in one frame?

That's what I used for years in many new builds for awkward basement window sizes. Look for a custom aluminum window company. Don't know about vinyl.

A single glazed slider is what I have. It's too cold a climate for it.

The issue is your 12" height from what I recall. Hoppers no issue with 12", sliders and awnings start at 14", even custom.

MWM is spot on with the general size cut-offs.

Two follow-up questions:

1) Where is the measurement taken from? If the 12" is inside of the old frame, you may gain the clearance needed by setting directly in the masonry.

2) Yes a hopper is a very valid option and frequently prescribed for this type of use. You mentioend being hard to reach, however a slider would require a similar reach? ... A good hopper will actually seal better than a slider, again, nice option here.

I looked at the space again. The hopper would tilt into the room and risk being hit by the inward-opening door.

I measured from inside the old frame.

A single glazed slider is what I have. It's too cold a climate for it.

That's why I mentioned TWO single glazed sliders in one frame--four pieces of glass altogether: two fixed, two sliding. They work fine in ourIEEC Climate Zone 5, cold, for small windows.

I'm having a hard time understanding what worthy is recommending.

One picture is worth a thousand...!

Here's an example of a double-glazed unit from the same company.

Source

They make them up to custom sizes. Particularly useful in a city of older homes. We found them very effective for basement windows, especially in new pours where the formers never seem to get the opening sizes exactly right.

You need to find a similar manufacturer where you are.

That appears to be the window they can’t get .

It could be more helpful to name the brand since the problem seems to be fiinding a manufacturer that makes one that short.

name the brand

Click the link. But they only service locally.

Actually, I finally did find a window that short (Andersen). But when I drew the frame on top of the glass I have to see what it would look like, the glass was shrunk to so small it was barely a window any more. :(

It looks like the slider storm aluminum windows have less frame. Is that right?

The chain/rope idea is a good one if I end up with a hopper. Do they also have less frame/more glass than the vinyl replacements?

Hoppers in general have a narrow frame and sash frame. best ro check it out as the can vary by manufacture.

This is what the steel buck looks like looking upward on the outside. Two window people have looked at it and said nothing about the horrible, rust, mold, whatever. One said he would pop in a replacement window. The other said I would not like a replacement; I should get the buck painted instead. The house was built in the early 80s. I don't think the original owners were particularly careful about things. Is this kind of rust typical or something to be alarmed about? I would really rather not tear out the buck even if I could find someone to do it. I seriously doubt I could find someone.

it looks to have solid metal on it. It should be Ble to be repaired.

I would remove it .

@juniperg92 You can get a direct replacement for the old Kawanee Sash Basement Windows here. They appear to have a 12" slider with IGU as a direct replacement.

What looks to be a steel lintel should not be removed. It's supporting the house above, typically a brick wall. You can scrape and sand off the paint and prime with rust paint, followed by a finish coat.

worthy, to tell you the truth, I'm not really sure what all that stuff is, and messing with it does worry me.

millworkman, that is a very interesting looking window. The spring clips are a new thing to me. I couldn't see anywhere how wide the aluminum frame would be, though.