Can you have a gas grill on screened porch with concrete floor?

It depends on the local building codes and regulations, but generally, it is not recommended to have a gas grill on a screened porch with a concrete floor. The reason is that gas grills can produce carbon monoxide, which is a poisonous gas that can be harmful to your health. If the screened porch is not properly ventilated, the carbon monoxide can build up and reach dangerous levels. Additionally, the heat from the grill can damage the concrete floor and cause it to crack or deteriorate.