| Base/Panel Length X Width Square base dimension on power roof ventilators. Square fan panel dimension on sidewall propeller fans. | 19 x 19 in |
| Curb Cap Size Square base dimension on power roof ventilators.Tells you what size roof curb is needed. | 19 in |
| Base Height Height of the curb cap on power roof ventilators. | 1 3/4 in |
| Base Top To Shroud Distance between the top of the curb cap to where the shroud begins on downblast power roof ventilators. | 2 in |
| Base Top to Shroud Top Dimension from the top of the base to the top of the shroud on a downblast exhaust ventilator. | 7 3/4 in |
| Damper Width x Damper Height The "ACTUAL" damper width and height. Dampers are undersized to allow them to be mounted into the duct work/wall opening. | 10 x 10 in |
| Height The height of a given product. | 7 3/4 in |
| Weight Weight | 8 lbs |
| Overall Diameter Describes the diameter at the widest point for a given product. | 20 1/2 in |
| Intake Area Intake Area | 1.72 ft² |
| Throat Area Throat Area | 0.57 ft² |
