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Cassette Blackout Blinds Side Channels/ Tracks Room Darkening

New Blocout Polka Dot Pink blind in bedroom

New Blocout Polka Dot Pink blind in bedroom

Cassette Blackout Blinds By Bloc Blinds especially relevant in darkening a room where light presents a problem.  Bloc Blinds developed this unique cassetted roller blinds system . The cassette blinds head rail has a height of 60 mm at the front and a depth of 45 mm. The cassette blackout blinds side channels/tracks/frames are 40 mm wide. As a matter of fact, the fabrics are reversed rolled.

There is 5 mm tolerance on the drop and 6 mm on the width.

Blackout roller blinds are often used to prevent light from entering a room and darken the room in general. In order to add blackout properties to the fabric, manufactures, add material that has additional layer added to it. To a large extent, it is reasonably successful but it will not stop all the direct light from entering the room. Light will still bleed through all sides of the fabric. Additional curtains are added to help solve the problem.

However, these blinds were formerly known as Eco Thermal Blinds otherwise Bloc 40 provide a solution to the problem. In essence, the cassette blinds are roller blinds with side rails/guides and cassette head rail. Additionally, the blinds are spring operated.

Cassette Blackout Blinds Fitting Range

  • Minimum Width 400 mm
  • Min Drop 300 mm
  • Max Width 1800 mm
  • Max Drop 1500 mm

Measuring Cassette Blackout Blinds

 How Cassette Blinds With Side Channels Work

First of all the blackout cassette blind has a head box. In addition,  Aluminium side channels are fitted to the head box. The combination of the head box with side channels, enables a room to be darkened. Within the side rails brush seals run all the way inside the side tracks. Most noteworthy are the blackout cassette blinds black seals on the the handle.  Pushing the handle towards the window allows the blind to move up or down. The combination of all these factors working together, enables the blind is able to block out almost most light.

Uniquely, as the handle comes into contact with the window sill, it  blocks the light from entering the room.  In other words  the blinds in essence is a spring loaded roller blind with side rails.

Energy Saving & Cooling Properties

Secondly British Blind & Shutter Association tests, shows heat reduction up to 43% through windows.

While the binds construction enables savings of heat in the winter as well as, reduce draughts, it also prevents heat loss from a room. Rubber seals at the bottom of the handle, create a barrier between the blind and the window sill.  Brush seals within the side rails aid in draught prevention.

The fabric forms a barrier between the room as well as the window thereby providing energy savings on heat costs. Consequently, heat within the room stays in the room.

Furthermore, during the summer, the blackout blinds with side tracks block out the sun and keep a room cool.

By the same token, all fabrics within the collection allows room darkening or keeping the room cool. Fabrics with white backing affords the best energy saving blackout blinds. As a matter of fact, a thermal energy saving blind suitable for use in bedrooms, cinema rooms or nurseries.

A wide selection of fabrics available.

Frame Colours

  • White
  • Cream
  • Silver

Blinds Safety

Third, the blind is spring operated without cords  thereby It does not pose a danger to children or animals. Ideal in playrooms as well as  children’s rooms. Equally, night workers, migraine suffers benefit from the Blocout system as a result of room darkening.

Difficult Windows?

  • Tilt and turn windows
  • Dormer windows
  • Loft window send a photo or two.  Contact Us 


Finally as a drill free product, the blind are easy to install. Necessary tools in order to fit the blinds include a hammer and screwdriver.

Fitting options available:-

  • Edge of recess- Fits on the edge of the window. Takes the least amount of time to fit of all the roller blinds with side guides.
  • Inside Recess/ Reveal – Batons 3 sides inside the recess. Blind fits onto the batons.
  • Surface 3 sides- A frame  is built and blind fits inside the frame. The frame screws to the outside window surface.
  • Surface 4 sides- Similar to surface 3 sides blinds. However, it differs as the frame/ channels comes with  an extra side, adds a bottom surface to close the blind. A great solution for windows without a window sill.

NB-  Wood 8 mm thick by 45 mm deep prove helpful in squaring a window.  Alternatively, wooden batons enabling blinds to fit in the recess is available as an option. Additional charges apply.

Check fabric suitability, please order a sample.

Blocout Cassette Blackout Blinds – Are NOT suitable for photographic rooms. 

Obtain an instant quote online. In fact a quote is available by entering the window sizes on the website.

Blocout blind formerly Eco Thermal Blinds From Bloc Blinds

Blocout Blind- Previously Know  As Eco Thermal Blinds

Maintaining Blackout Blinds With Side Rails

Provided that the blinds are lightly dusted, hoovered regularly as well looked after, they will provide years of service.


Other fitting videos available.

Windows larger than 1800 mm wide/ 1500 mm drop – Blocout XL 80 Larger system with side guides.