What Is Fan Fold

n. A continuous sheet of paper that is folded in a regular, alternating fashion.

What is fanfold used for?

Fanfold insulation is an extruded polystyrene foam insulation which is designed to be applied to the exterior walls of homes, between sheathing (or pre-existing sidings) and usually vinyl siding. Its purpose is to provide thermal protection and to form a second barrier between the elements and the framing.

What is a medical fanfold?

a pad or tablet of invoices, bills, blank sheets, etc., interleaved with carbon paper.