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Origin Doors

Window Size Guidelines

Minimum dimensions

Fixed frame

Fixed frame size diagram

Fixed frame

Dummy sash

Dummy sash size diagram

Dummy sash

Casement Window:

Min height = 385mm with cill and 35mm add-on
Min height = 350mm with just a cill
Min height = 325mm just the frame

Top hung minimum

Top hung minimum size diagram

Top hung minimum

Min height = 400mm
Min width = 400mm

Side hung minimum

Side hung minimum size diagram

Side hung minimum

Min height = 400mm
Min width = 400mm

Maximum sash dimensions

Side Hung Maximum Dimensions

Maximum sash weight 40kg diagram

Maximum sash weight 40kg

Side Hung Maximum Dimensions

Top Hung Maximum Dimensions

Maximum sash weight 50kg diagram

Maximum sash weight 50kg

Top Hung Maximum Dimensions

Fixed frame maximum dimensions

Maximum area = 4.8m2
Maximum height/width = 4.8m

Example 1

Example 1

Maximum fixed width and area

Maximum area = 4800mm x 1000mm = 4.8m2
Maximum width = 4800mm

Example 2

Example 2

Example 2

Maximum fixed height and area

Maximum area = 4800mm x 1000mm = 4.8m2
Maximum height = 4800mm

Example 3

Example 3

Maximum fixed area

Maximum area = 2200mm x 2200mm = approx 4.8m2

Maximum mullion/transom length

Maximum glazed area next to mullion/transom: = 3.15m2 Maximum length: = 2100mm

Example 1

Example 1

Maximum mullion length and glazed area next to a mullion/transom

Maximum glazed area next to mullion/transom = 1500mm x 2100mm = 3.15m2
Maximum height = 2100mm
(Window width of 4500mm is under maximum of 4800mm)

Example 2

Example 2

Maximum glazed area next to a mullion/transom

Maximum glazed area next to mullion/transom = 2400mm x 1430mm = 3.15m2
Maximum window width = 4800mm(Mullion is under maximum height of 2100mm)

Example 3

Example 3

Maximum transom

Transom under maximum width of 2100mm
Maximum glazed area next to mullion/transom = 2100mm x 1500mm = 3.15m2

Maximum coupled length

Maximum coupled length: = 2.5m

Example 1

Example 1

Maximum coupled height with maximum individual glazed area.

Maximum coupled height = 2500mm
Maximum glazed area = 1920mm x 2500mm = 4.8m2
(Overall width at 5760mm is fine as each frame is coupled)

Example 2

Example 2

Maximum coupled height with a maximum transom

Maximum coupled height = 2500mm
Maximum transom length = 2100mm
Maximum glazed area next to mullion/transom = 2100mm x 1500mm = 3.15m2

Example 3

Example 3

Maximum coupled width

Maximum glazed area = 2500mm x 1920mm = 4.8m2
Maximum coupled length = 2500mm

Example 4

Example 4

Maximum coupled gable width, minimum gable corner angle and maximum mullion

Maximum coupled length = 2500mm
Maximum mullion length = 2100mm Tightest gable corner angle = 20°

Example 5

Example 5

Maximum coupled width and height with tightest gable corner angle

Maximum coupled width and height = 2500mm
Tightest gable corner angle = 20°

Gables

Minimum Gable Angle 20°

Minimum Gable Angle

Minimum Gable Angle 20°

Gables mullion restrictions

Mullions cannot be joined to another joint or apex in the frame:

Incorrect configuration

Mullions cannot be joined to an apex like this

Correct configuration

In this instance, the gable must be made out of two parts and coupled together.

Minimum gable up-stand

Minimum Gable Up-stand = 100mm. Minimum bead = 100mm

Gable up-stand example

The minimum up-stand on a gable is 100mm.
Similarly, in the diagram above, if a mullion splits a small section of frame, there must be at least 100mm of profile either side of the mullion.

Maximum gable size

Maximum mullion length 2100mm
Maximum profile length 4800mm
Maximum coupled length 2500mm

Maximum gable size example 1

Example 1

Maximum gable size example 2

Example 2

Minimum transom drop

Minimum transom drop

415 with 15mm frame extension
435 with 35mm frame extension

Minimum sash width with trickle vent

Minimum sash width with trickle vent

Bay window tightest angle

Minimum sash width with trickle vent

Tightest bay angle 117°