Airflow Draught Buster Core Drill Vent - 5" Brown

Through Wall Draught Reducing Vent. Meets all BS5440 Pt 2 : 2009 requirements for draught reducing vent. Patented Product. High draught resistance. High equivalent free area. External flush fit with optional external cowl included. Tested to Advantica test procedure. Passed test Procedure. No direct light penetration. Reduces noise penetration. Ability to have airpath inspected to check for blockage. Unable to become blocked by cavity foam insulation. Louvre gaps to stop vermin or becoming blocked.