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GDL is a privately owned manufacturer and supplier of a large range of louvre systems, air diffusers, grilles, natural ventilation systems, brise soleil and dampers.
7. Grilles











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LIGHTWEIGHT PRESSURE RELIEF UNIT
For low pressure relief application, typically 5-75 pa. Used for room to room pressure control or a basic non-return valve.
HEAVY DUTY BACK DRAUGHT DAMPERS
For low pressure relief application, typically 10-50 pa, or as a non-return valve. Used where air velocities of up to 10 m/s may occur.
LOW LEAKAGE INSULATED DAMPERS
This damper gives a low air leakage rate of below 5m³/hr/m² and an insulation value of 1.8 watts/m²/°c. The linkage is enclosed.