1.   And of course, the unseen and essential new foundation, new wiring, new heating ducts, two new bathrooms and new insulation.

2.   Dragging a ladder behind her, Helen Soltys maneuvers under a raw ceiling of tangled wires, sagging pink insulation and heating ducts.

3.   Removing heavy concentrations of mold from air and heating ducts is a job for a professional.

4.   The air was thick with gypsum, dust, asbestos, even heating ducts.