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Question
As per IS standard specifications for timber door, window and ventilator frames, the symbolic designation of 12 DT 20 would indicate:
A.
frame of window shutter door with a width of 12 modules and height of 20 modules
B.
frame of ventilator with a width of 12 modules and height of 20 modules
C.
frame of defined shutter door with a width of 12 modules and height of 20 modules
D.
frame of double shutter door with a width of 12 modules and height of 20 modules
Answer ( Option D)

frame of double shutter door with a width of 12 modules and height of 20 modules

Solution

As per IS 4021: 1995
'12 DT 20' would mean a frame of a double shutter door with a width of 12 modules (119 cm) and a height of 20 modules (199 cm).

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