- 4-inch vent cover for exhaust and ventilation systems in homes and commercial spaces - Versatile use indoors and outdoors, protects against rain, wind, snow, pests, and birds - Made of high-quality plastic with UV stabilizer, resistant to sun fading - Easy installation thanks to its one-way flap design and grille cover - Precise dimensions: flange opening 9.9 cm, insertion height 3 cm, exterior 15.3 x 14.8 cm - Space between screw holes: 11.1 x 9.5 cm - Ideal as a replacement for dryers, HVAC systems, and home ventilation - Durable, reliable, and environmentally friendly material ensures efficient airflow