What is the minimum clearance to combustible materials for a duct system operating between 125 degrees and 250 degrees?

When considering the minimum clearance to combustible materials for a duct system operating between 125 degrees and 250 degrees Fahrenheit, the correct requirement is 3 inches. This distance is established to ensure safety and prevent potential fire hazards.

Combustible materials can ignite when exposed to high temperatures, and therefore, maintaining a specified clearance is crucial in protecting these materials from heat generated by the duct system. A clearance of 3 inches provides adequate space for air circulation, which helps to dissipate heat and minimize the risk of ignition.

Understanding industry standards is vital in these assessments. Higher clearance values typically apply to duct systems operating at higher temperatures or those carrying more hazardous materials, which is why options suggesting distances greater than 3 inches are less applicable in this context.