1.14×14 inches standard size: Our RV vent fan can fit the roof opening of 14 inches RV tightly, and also fit MAX 14-1/2 inches opening (the gap is not very big). It fits RV roofs with thickness of 1.9-7 inches, but you may need to trim the trim when the thickness of your RV roof is about 1.9-6.1 inches. Remote Control: Compared with manual control, the remote control RV roof fan is not only more convenient and safer when you can’t reach the ceiling quickly and easily, but also can be manually controlled in some emergency situations. In addition, it is equipped with an automatic rain sensor function for automatic shutdown. Built-in light illuminates your RV (button designated control). You can easily operate it with buttons or lights, providing flexibility based on your preference. Quiet and Energy-saving: The 12V RV fan is very quiet and energy-saving when running, with a maximum noise level of 35dB and 20 watts when running in high power mode. Enjoy a quiet, undisturbed environment inside your RV. Reversible Airflow: The roof vent can be used to draw fresh air into your RV or exhale hot air out of your RV. The RV roof fan can be operated in reverse/forward mode. This RV roof vent can be operated from 1 1 to a maximum of 10 in low forward/reverse mode. Product Size: 41.541.5cm. Thermostat: 4A Slow Blow. Dimensions: 14” x 14” opening /36cm. Drawing: Transparent Fan Blades. 20 Speed Levels: 10 Inlets, 10 Outlets.