The minimum recommended size for an adult dragon is something with 6-8 square feet of floor space and at least 18 inches in width. If I remember correctly, the crossfire is 4 ft long and 18 inches or 2 ft week, which meets those minimum requirements. So technically, yes it is large enough. If your dragon is used to a larger home and/or spends a lot of time in his enclosure, you may want to tweak the dimensions to make it a bit larger. This enters that grey area of what you personally consider good enough for your dragon.