A door that is constructed with spacers between the face panels for lateral support is known as what type of door?

A door that has spacers between the face panels for lateral support is referred to as a hollow-core door. This design typically consists of a thin outer skin made from materials like plywood or medium-density fiberboard (MDF) enclosing a honeycomb or grid-like structure made of cardboard or wood. The spacers, which create the hollow center, contribute to the door's lightweight nature while still providing sufficient strength and stability for residential or commercial use.

In contrast, solid-core doors do not contain this hollow construction and are made from solid wood or composite materials, providing enhanced durability and soundproofing but at a heavier weight. Folding and sliding doors are designed primarily for space-saving and functional purposes rather than construction with spacers for lateral support. Therefore, when identifying the door type that features spacers for lateral support, the hollow-core door is the most fitting choice.