This Kair Louvred Grille is designed for efficient air ventilation. It features a 125mm / 5-inch round spigot on the rear, compatible with standard duct pipes and hoses. The grille has fixed louvres and a 155mm x 155mm external dimension, making it suitable for both indoor and outdoor use. It's easy to install with a simple push-fit mechanism and can be sealed if necessary. Constructed from high-quality UPVC Polystyrene/Polypropylene PVC material, it's built to last. This grille is ideal for various applications including bathroom and kitchen extractor fans, hydroponics systems, and in-line extract fans. It complies with Part F Building Regulations and has undergone independent airflow performance testing. The operating temperature range is +60c to -15c. Genuine Kair product, made in the UK, ensuring compatibility with their extensive range of ventilation components. It can be used as part of a long ductwork run for whole house ventilation, passive stack ventilation, positive input ventilation, air conditioning, HVAC, and Heat Recovery systems.