Field glossary

Clearance to combustibles

The required air gap between a hot grease duct and burnable construction, commonly 18 in unless reduced by a listed method

Used across 3 Anvilfield field guides, most in HVAC.

Also defined as

Landscaping: The distance from the fire and its heat to anything that can burn, horizontal and overhead
Listed minimum distance from the heater to anything that can burn, in every direction

Where this shows up