A fog stream cone ranges from a narrow ___________________ pattern to a wide 90-degree pattern.

A fog stream cone typically spans from a narrow to a wide pattern, with the wide pattern generally recognized as a 90-degree angle. The narrow end of this spectrum aligns with the industry standard practice, which identifies the most common starting point for a fog stream cone at a 30-degree angle. As the stream expands, it can achieve wider angles, but the specific choice that represents the narrower part of the range leading up to the 90-degree spread is the 45-degree angle.

The rationale for this is rooted in firefighting technique and efficiency. A 45-degree angle strikes a balance between coverage area and precision, allowing operators to effectively combat heat and control fire spread while utilizing the advantages of fog patterns, such as increased steam production and heat absorption. Thus, the range of a fog stream from narrow to wide encompasses patterns that successfully adapt based on the fire conditions and the need to manage both the heat and smoke effectively.