The amount of damage per combat round suffered from fire or heat will depend on its intensity, as shown on the Fire and Heat table. Metal armour, such as plate or chain mail, does not subtract from the rolled damage.

Fire and Heat Effects

Source Example Damage/round
Flame Candle 1 point
Large Flame Flaming brand 1D4
Small Fire Campfire, cooking fire 1D6
Large Fire Scolding steam, large bonfires, burning rooms 2D6
Inferno Lava, inside a blast furnace 3D6