From The Anvil Large Aluminium Trickle Vent
Size: 380mm x 17mm
Slot Size: 336mm x 12mm
Equivalent Airflow(EB): 1600 mm2
91008 (12555) Brown
91009 (12556) White
Infinitely controllable. Easy to fit. Suitable for timber and ideal for night ventilation, does not compromise on security. User friendly operation.