If your basement means home to your furnace, it’s always a good idea to keep spare gas cans somewhere else. As a general rule, anything combustible, like gasoline, should be given wide berth from potential fire hazards like furnaces.
12. Cat litter
This is another pet product you’re better off keeping out of your basement. In addition to potentially clumping when it’s exposed to moisture like the humidity in your basement, if you’re actually allowing your pet to use the basement as a bathroom, here’s what you must know: the ammonia in their urine becomes potentially combustible when stored too close to your furnace.