How to
Square Soffit Vent Covers
Square Soffit Vent Covers. These meshes obstruct a portion of the airflow. It is generally a great idea to get some form of cover for your vents to help combat this risk.

The general rule of thumb for the amount of soffit ventilation required is to have at least one square foot of ventilation for every 150 square feet of attic space. Usually, perforated vents are made for houses with vinyl siding. Space the soffit vents evenly around the bottom of the low sides of your roof.