Need Help? - Phone us: 01908 503482

Mon- Fri 9:00 am - 5:00 pm

Blocout XL Cassette Blackout Blinds With Side Tracks

Blocout XL Cassette Blackout blinds system for larger regular rectangular shape windows. Formerly called Bloc 80 XL blinds, in other words, roller blinds with side rails/tracks/frames/bars and cassette head box. The larger cassette blinds with side tracks provides the option to fit on larger domestic windows.

Blocout XL Blackout Roller Blinds Size Restrictions

The cassette blinds needs a minimum width 400 mm, maximum width of 2400 mm. The minimum drop 300 mm,  maximum drop of 2400 mm. 120 mm clearance for handles or obstructions for recess fit. Side rails/tracks/rails/ bars measures 50 mm wide plus 35 mm deep. Surface mounted, an additional 140 mm is added to the top of the window opening and 100 mm on the width to allow for clearance so that the blind can operate correctly. Blocout XL Blinds provides room darkening properties in larger window. Therefore, the blinds are suitable in bedrooms, lounges, studies, TV rooms or cinema rooms.

For commercial installations the blackout cassette blackout blinds with a suitable fire resistant fabric is advisable. In either bathrooms or wet rooms a roller blind cassette system with PVC fabric provides a perfect solution.

In addition, the blinds work well as blackout blinds for sash windows. However, the fabric can be blown out of the side rails if the windows are open and the wind creates a vacuum between the glass and the blind. The same can happen if a person enters the room and the wind gets hold of the blind.

The cassette blinds provides the latest design by Bloc Blinds in room darkening. All blinds made in UK.

Blocout XL Blind in Redcurrant in a child's room

Blocout XL Cassette Blinds in Redcurrant in a child’s room

NB These Blinds are NOT suitable for cinema rooms, photographic rooms or skylights on slopping ceilings.

How Blocout XL Cassette Blackout  Blinds Contrast With The Smaller Blocout Blinds

In the first instance both blackout blinds work in a similar way. A cassette box and side rails/tracks is available on both blinds. Each blind is adept at keeping the warmth in a room in winter.  At the same time both block out light in the summer. Yet, the larger cassette blackout blind is operated by a metal chain as opposed to the spring blind that is found on the smaller blind. The chain can lift the extra weight the smaller spring system can’t handle. Chain colour option is silver in colour only.

Additionally, the larger cassette blinds with side rails has the option to be motorized. As a result a motorized cassette blackout blind is safe by design.

Importantly, the option to use the motorized blind with Google Home or  Amazon Alexa now available. A Bloc Hub is available which works with downloading the Bloc App to use voice control.

The blackout blinds with side tracks are standard roll only.  Furthermore, blackout fabrics available for both systems be their plain as well as pattern.

The Blocout XL Cassette Blackout blinds larger side channels allows for greater tolerances when fitting in the recess. That is to say the width now has a 20 mm tolerance.

Fabric pelmet an additional option at extra cost.

Moreover, frame colour currently available in white on the larger cassette roller blinds.

Similarities of Both Blinds with Side Channels

By the same token, brush seals run down each channel/guides in addition rubber seals aid energy saving. Similarly, aluminium channels or tracks plus cassette head box contributes to the blinds weight and strength.

Both blinds allows levelling using Guide Dogs. A unique system on the market for roller blinds with frames.

Both blinds are precision cut to window sizes given. Additionally, both blinds prevent heat loss from a room in the winter as well as keeping a room cool during the summer.

Both cassette blinds are suitable for night workers or keeping the sun’s rays at bay during the summer months. In addition, the roller blinds cassette system,  in addition with side rails prevents TV glares in home cinema rooms.

Measuring Up- Blocout XL Cassette Blackout Blinds

Tip! Measure where you wish to fit the cassette system. Use a pencil to mark the measurements. This aides fitting.

Videos explaining how to measure both types of Blocout XL Cassette Blackout Blinds with side tracks:-

Instant online quotes available for made to measure roller blinds with cassette.

Fitting the Blocout XL Cassette Blinds

It is possible to fit the larger cassette blackout blinds in the recess or surface mounted. In contrast it is possible to fit the smaller Blocout Blinds on the window edge, recess or surface.

However, all cassette blinds with side guides MUST be fitted squarely. If the reveal is not square, use wood to pack out the recess/reveal.

The blinds have been tested by the British Blind & Shutter Association on their ability to reduce heat loss from a window and it found a 43% reduction in heat loss. As a result, it has won awards for its design.


Most of all the Blocout XL Cassette Blinds can be motorized rather than chain operated. Motorization as a result ensures no cords pose a danger, thus improving safety. The battery is rechargeable. The cover at the end of the cassette head rail can be removed, revealing the charging port. By plugging in the charging cable into the port and the other end to the plug the blind takes a couple of hours to charge. The electric cassette blinds allows operating the roller blind with guide rails from the comfort of a chair.

Accordingly, the manual option includes a safety device. As a result, the installation height is essential to calculate the chain length so as to comply with blinds safety regulations in these circumstances.

Ordering Extra Help

Email A photo or two along with measurements of any window you wish to dress using this blind.

Order a sample/ samples to check the properties of the fabric and colour as monitors and devices can distort the real colour of a fabric.

NB Fabric maximum width 2000 mm on most fabrics.  As a result, larger cassette blinds with wide widths or drops will been joined to obtain the chosen sizes.


Motorization- Blocout cassette blackout blinds are best for larger windows. This options allows control of the blind from the comfort of a seat.

In conclusion, the blinds avoid the halo effect often seen on regular blackout blinds. Regular blackout blinds don’t have side rails. Suitable for cinema rooms, bedrooms, playrooms in addition to night workers.

All blackout cassette blinds with side rails are made to measure. Blinds quote available online.


The factory is currently on 15 working days for these Blocout XL Cassette Blackout Blinds with side rails when fabric and components are in stock. If any go out of stock, the production times will increase.

For blinds over 2400mm wide and 2300 mm drop, choose either Commercial Blinds with side rails crank or chain.

To operate the blind with a battery or hard wired see the Commercial Blinds with side tracks.


There is a 1 year guarantee on fabric and 3 years on the hardware.