Efficiently manage airflow with our 9" x 3" Hit and Miss air vent, designed to fit single brick apertures (229mm x 76mm). The adjustable sliding grill lets you control ventilation, helping to mitigate issues like stale air, dampness, and condensation. Suitable for both interior and exterior use, this vent is ideal for fresh air and warm air systems. It’s quick and easy to install (screws not included) but not suitable for gas appliance venting. Designed to cover single brick apertures 9" x 3" (230mm x 80mm) with an adjustable sliding grill to accommodate open & closed positions. The Hit & Miss design easily allows or restricts external airflow, making it suitable for interior and exterior use for fresh air ventilation and warm air systems. Fast and easy to install (Screws are not included). Manufacturer: Map Hardware