Stadium BM700-5 Anti-Draught Black Hole Brick Ventilator – Wind-Resistant, Quiet, and Efficient Ventilation The Stadium BM700-5 Anti-Draught Black Hole Brick Ventilator offers a smart and effective solution for reducing drafts, noise, and light penetration while maintaining essential airflow. Featuring advanced Black Hole technology, this ventilator forms internal vortices to slow down incoming air, minimising drafts and ensuring a more comfortable indoor environment. Designed for double brick-sized walls, it includes a cavity liner, anti-draught baffles, and a white internal grille to provide a reliable and efficient airflow solution with a free area of 100cm². Key Features: 100cm² Free Airflow Area: Prov