PLEASE READ! ! ! !I have to start out with saying that with this set up, you need to keep the fire small. Just because a fire blanket is flame proof, theres no need in a huge roaring fire. A small fire is all it takes to heat in this set up This is a pretty safe way of heating a shelter for 1 to 4 people depending on the size of tarp used if you follow the rules of using a SMALL FIRE.