The L frame is the most popular choice of frame.
It’s named this way because its shaped like an ‘L’.
The L frame is available in three different sizes, small, medium and large. The size you need will depend on the louvre size or how far your window handles protrude.
Side Fix Frame
The side fix frame is the same depth as the medium L Frame. It has a flat front allowing the frame to be cut/planned to shape to fit the window.
It’s a harder frame to fit, so best left to expert DIY’ers or Carpenters. It’s designed to be fitted without the standard 5mm clearance gap, though a suggested 2-3mm clearance is recommended.
The frame has to be fitted independently of the shutters. This means levelling the frame and ensuring its square when screwed into place.
Each of the three L frames looks the same from the front, it’s the back stop that is extended to create the different depths. The extra depth is required for larger louvres or getting over obstacles protruding from the window frame.
- Small frames are 46mm deep
- Medium frames are 60mm deep
- Large frames are 76mm deep
- In ABS the frame depths are 50mm and 60mm.
Side fix frame
- Side fix frames are 60mm deep
Frame sides, choose from:
- 4 Sided (Standard)
- 3 Sided (No bottom)
- 3 Sided (No top)
- 2 Sided (No top or bottom)
- 1 Sided
- No frame
If you are thinking of adding blackout blinds in the future, then upgrade to the medium frame so there is room to fit the blind.
The depth of the frame is important when measuring for bay windows because of the angles involved.
When to choose L frames?
- When fitting inside the recess
- For Sash windows
- Easy and quick fitting
- Hidden fixing points behind removable inserts strips
- Built-in back stops with magnets to reduce light and increase rigidity
- Adjustable shutter hinges for flexibility
The number of frame sides will not affect the cost.