Transom (architecture)

For other uses, see Transom (disambiguation).
Look up transom in Wiktionary, the free dictionary.

In architecture, a transom is a transverse horizontal structural beam or bar, or a crosspiece separating a door from a window above it. (This contrasts with a mullion, a vertical structural member.) Transom or transom window is also the customary U.S. word used for a transom light, the window over such a crosspiece.

Speakers of British English usually call such a transom light a "fanlight". Fanlights often have a semi-circular shape, especially when the window is segmented like the slats of a folding hand-fan. A prominent example of this occurs at the main entrance of 10 Downing Street, the official residence of the Prime Minister of the United Kingdom.


This article is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.