Customer has a furnace inside the attic. Can a utility room be built around the furnace to isolate the furnace from the rest of the attic?

Check with the furnace manufacturer and local codes before building a box around a furnace in an attic.

Check with the furnace manufacturer and local codes to confirm if special installation measures are needed and if it's even acceptable to build a box around a furnace in an attic for the purposes of isolating it.