A fire pit should never be used in enclosed spaces without proper ventilation, as you run the risk of hotboxing yourself with dangerous fumes like carbon monoxide. In other words, covered patios are a definitive no-go. (We wouldn't stick a fire pit under a gazebo, pergola, or umbrella, either, because you risk singeing whatever's above it.) Some brands say their fire pits are safe for use on decks or green grass if you put them on some sort of stand, base, or heat shield, which is typically sold separately from the unit itself, including Solo Stove, Fireside Outdoor, and Breeo.