What are the double hung windows called that have an upper sash shorter than the bottom?

What are the double hung windows called that have an upper sash shorter than the bottom? Topic: What are the double hung windows called that have an upper sash shorter than the bottom?
July 21, 2019 / By Ayn

Question: I saw double hung windows. The top sash is about 1/3 smaller than the bottom sash. What are they called? Who sells them?

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