Double-hung window
A window with an upper and a lower sash that slide up and down. The plan shows the sash lines in the wall, with no swing.
Easily confused with
How to read it
In the Navy's Builder 3 & 2 course the two sashes slide vertically in grooves in the side jambs, and the window opens to at most half its area. The Army's print-reading manual uses the double-hung window as its example of a symbol that can't show movement: the sashes move perpendicular to the page, so the plan shows only the window in the wall. The Navy's Builder Basic course includes it among its window symbols.
Also searched as: sash window.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
Look-alikes
A sliding window is drawn with its two sash lines offset, because its sash moves along the wall.
Read next
- Next in Blueprint symbolsDuplex receptacleA standard wall outlet with two sockets. The symbol marks where the outlet is on the wall.
- The same shape in Acura dashboard symbolsAcura Road Departure Mitigation (RDM) indicatorAcura’s Road Departure Mitigation (RDM) indicator comes on when there is a problem with RDM or when the system has shut itself off. RDM is the Acura system that warns, steers and sometimes brakes when the car is about to cross detected lane markings or leave the road.
More blueprint symbols
The same shape elsewhere
Browse symbols drawn with lines or squares and rectangles.
Sources
- Builder 3 & 2, Volume 2, NAVEDTRA 14044, Naval Education and Training Command, U.S. Navy, ch. 4, double-hung windows
- Construction Print Reading in the Field, TM 5-704 / AFM 85-27, Departments of the Army and the Air Force, para. 2-2a
- Builder Basic, NAVEDTRA 14043A, Naval Education and Training Command, U.S. Navy, ch. 3, fig. 3-19
- Blue Print Reading: Interpreting Working Drawings, E. M. Wyatt, 1920, Bruce Publishing Company, Milwaukee (Internet Archive), Plan reading exercise
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 24, 2026. How we research
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