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Prisons and Detention Centres

Waterloo – Security Grille Experts

Cells require adequate ventilation and a regular air change, but the grilles need to be secure and safe, particularly against the threat of ligatures. Waterloo have developed over many years a range of grilles in conjunction with the prison service for the supply and extract of air in places where security is a priority – ie Prisons, Courts, Young Offender Detention Centers and Police Stations to secure buildings, indeed any building with detention facilities.

The Waterloo SG series security grilles are manufactured as standard from 3mm thick mild steel plate and are available in three versions –

HMP Canterbury

SG1, SG2 and SG3 – able to meet ventilation needs in high, medium or low security applications. Each type of grille can be supplied with a range of Plenum boxes, Opposed-Blade Dampers and Fire Blocks. Waterloo grilles can be wall or ceiling mounted. Other material types, accessories and a range of finishing options are also available.

  • SG1 High Security Grille With Rear Fixing.SG1SG3 Close-Up
  • Medium Security Grille With Face and Rear Fixing.
  • Low Security Grille With Face Fixing.SG3 SmallSG3 Close Up

For full technical information go to

Waterloo have successfully supplied products to a very large number ofPrison development and refurbishment programmes – and recent projects include;

HMP Dovegate

  • HMP Ashwell
  • HMP Dovegate
  • HMP Isle of Man
  • HMP Leeds
  • HMP Rochester
  • HMP Bullingdon
  • HMP Cookham Wood
  • HMP Wandsworth
  • HMP Canterbury
  • HMP Wellingborough