01 / The detail
Distinguish a neat headbox from a blackout unit
A small decorative cassette may simply cover the fabric roll. A side-guided system introduces further components, while a purpose-designed blackout unit has specific detailing to control light around the whole perimeter. Those are different levels of specification.
If darkness is critical, tell us the use of the room and the acceptable result. We assess an appropriate unit and installation rather than treating the word cassette as a performance guarantee. Fabric selection remains important, but cannot compensate for unsuitable edge detailing.
02 / The detail
Survey the surfaces the system will meet
Channels need a suitable position along the sides of the opening. Tiles, uneven reveals, handles and projecting trims can affect that position. The headbox also has a depth and height that must be allowed for above the fabric.
We check how the window opens and where the bottom edge will finish. The chosen system may fit within the reveal or across its face, with different visual and light-control consequences. Agreeing those details avoids ordering components for an opening that cannot support the intended layout.
03 / The detail
Keep the mechanism accessible after fitting
Cassette systems may be operated manually or by a compatible motor. We check control reach, required safety devices and, for powered versions, the supply and any separate connection work. Service access should remain possible if the roller or motor later needs attention.
The installation is completed with an operating demonstration and the applicable care guidance. Keep side channels free of debris and avoid pulling fabric out of its intended path. If the room is being refurbished, tell us about planned decoration or joinery before the system is measured.



