| Traditional systems rely on above-ceiling installation of ductwork and large distribution units. |
| Consider replacing any ductwork that has an interior lining to minimize the buildup of dirt and moisture on inside surfaces. |
| As dirt accumulated on fan blades or within ductwork, it reduced the possible airflow through the system. |
| This creates the cavity between the joists and the ceiling where pipes, wires, and ductwork can be installed and worked on. |
| Filters are also installed in the hood to catch grease and prevent accumulations in the ductwork. |
| In the attic, determine whether openings for items such as pipes, ductwork, and chimneys are sealed. |
