COMPATIBLE WITH UP TO 4" OPENINGS: Circular vent cover fits round ducting systems equal or smaller than 3.94" inches. Screw hole spacing is 4.53" and the exterior grille diameter is 5.28". Pre-drilled hole diameter is 0.14". Perfect for HVAC exhaust or intake installation in any room, ideal as a ceiling or wall air vent grille. DURABLE & LIGHTWEIGHT PLASTIC: Made from quality plastic; weather-resistant and long-lasting. Built-in mesh screen keeps out debris and dust, making it great for attic, roof, and bathroom ventilation. Temperature resistance from -4°F up to 158°F. BUILT-IN PROTECTIVE SCREEN MESH: Fine mesh backing helps block unwanted debris and particles while allowing smooth, efficient airflow. EASY WALL OR CEILING MOUNTING: Can be quickly installed in various spaces without special tools, making it perfect for fast home or office upgrades. (SCREWS NOT INCLUDED). Suitable for both wall and ceiling installation. MULTI-ROOM HVAC APPLICATIONS: Ideal for home improvement, such as in the bathroom, kitchen, garage, shed, office, and RV to improve airflow and ventilation efficiency. Vent systems works with manufacturers, markets and distributes products and system solutions for simplified construction and improved indoor climate. // The products are characterised by their quality, ease of assembly and consideration towards the environment. // We simplify construction // At Vent Systems, we simplify construction because it is in human nature to build. By simplifying in every stage, we make it easier to install seamlessly. We develop products with people in mind. We offer solutions that meet the demands for comfort, simplicity and aesthetics. // We are driven by a strong passion and desire to continuously offer improvements. // Partly for all the customers and partners who use our products and solutions, but also for the people who live and work in buildings that uses our products. We simplify construction and help to create a healthy indoor climate. // Ideal for all tumble dryer vent pipes / hoses, bathroom extractors & vents, air conditioning and heating units, kitchen vents & fans, all home wall and ceiling vents, heat transfer and ventilation systems, gas & electric dryers, cooker hood extractors, as well as a wide variety of industrial uses.