The Lo Carbon Revive SELV 7 REF 473849A Continuous Running Bathroom and Kitchen Fan by Vent-Axia is an energy-efficient extractor fan designed for optimal ventilation in bathrooms and kitchens. With a high energy efficiency rating of A, this inline fan features a 4-inch diameter and a sleek white design. Its continuous vent style ensures a consistent flow of air, making it an essential component for maintaining air quality in your home. With a focus on reducing carbon emissions, this fan is a practical and eco-friendly choice for improving the airflow in your living spaces.