Embers are a big problem, and another one is vegetation near your house. If you have a big dry bush just outside your patio door and it starts to burn, the infr

Embers are a big problem, and another one is vegetation near your house. If you have a big dry bush just outside your patio door and it starts to burn, the infrared coming off it can go right through the glass and catch the inside of the house on fire before the outside starts to burn. This is why we preach defensible space (no vegetation within 30-50 feet of the structure).