These blinds are those based on the roller blind.

• Blackout blind - blind giving as near to total light exclusion as possible.
  
• Dim-out blind “ blind giving a substantial reduction in light level but still allowing a certain amount to penetrate. They may be plain roller blinds or may make use of casing or masking. The level of dim-out is best specified by reference to the use required of the blind.
• Dark blinds - see dim-out blinds above.

• Audio visual blinds - generally low level dim-out blinds for such purposes as slide projection, presentations and VDU screens. This term is most usually applied to special venetian blinds.

Components

• Roller -can be spring assisted or plain roller operated by pull cord and cleat, ball chain, pull tape, gear and handle or electric motor (see roller blind section).
• Fabric -also cover or blind cloth.
• Bottom rail (also bottom bar or hem bar) - rail fitted to bottom or leading edge of fabric.
• Cross rib (also wind lath or windcheat) - a stiffening rod usually held in a pocket across the width of the blind to prevent wind blowing the blind out of the casing.
• Edge stud (also button) or edge bead (zip) - a device fitted to the edge of the fabric to prevent it pulling out of the special side channel.
• Blind box (also headbox or roller casing) - total enclosure for the blind roller with removable face for access.
• Side channel (also side guide or side groove channel) - section in which the edge of the blind runs.
• Cill channel (also bottom channel or bottom groove) - to form light seal at bottom edge of blind.
• Fillets (also batten grounds) - usually in wood. Fitted to enable casing to be installed.
• Light seal (also sealing strip) - applied when fixing blackout blinds to uneven surfaces to render join light proof. Can be foam strip, felt, mastic or brush.

NOTE: It is near impossible to achieve 100% light exclusion with a blind that can be opened. This excludes the use of working blackout blinds in such situations as photographic dark rooms where high speed emulsions are exposed. Blackout blinds have totally opaque fabric and are fully enclosed in casing.

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