Talk:Env fire

I have put multiple env_fire entities in my map, which ignite each other. Some of these have the "Start On" flag checked. When I tested the map on Counter-Strike: Source, I was hurt by only those with the aforementioned flag checked. Also, I do not understand the damage scale. How much damage does it do with the normal scale (1)? Are there any factors that change this damage amount, besides the ability to change the damage scale?