Building Construction Handbook, Eighth Edition

Window manufacturers identify their products with a notation

that combines figures with numbers. The objective is to

simplify catalogue entries, specification clauses and schedules.

For example:

head

1350

1770

fixed light

sill

left-hand casement vent-light

as viewed from front

right-hand casement

as viewed from front

Ref. 313 CVC

Notation will vary to some extent between the different joinery

producers. The example of 313 CVC translates to:

3 = width divided into three units.

13 = first two dimensions of standard height, ie. 1350 mm.

C = casement.

V = ventlight.

Other common notations include:

N = narrow light.

P = plain (picture type window, ie. no transom or mullion).

T = through transom.

S = sub-light, fixed.

VS = vent-light and sub-light.

F = fixed light.

B = bottom casement opening inwards.

RH/LH = right or left-hand as viewed from the outside.

Window Notation