- DB10 Pressure Sensing Switch, 1 Piece
- 3' Section of Tubing, 1 Piece
- Grommet for Tubing, 1 Piece
- Wire connectors for Electrical Connection, 4 Pieces
The electrical supply to the booster fan is connected in series through the DB10 switch. One end of a pressure tube is connected to a nipple on the switch, the other end of the tube is tapped into the dryer duct through a grommet. Within ten seconds of the dryer beginning operation, positive pressure in the duct causes the switch diaphragm to close, activating the electronic timer circuit. The timer directs power to the fan in consecutive five minute cycles, effectively providing continuous boost as long as the dryer is on. When the dryer finishes its operation, the fan will complete the five minute cycle that it had started before the dryer stopped and then it will begin one final clearing cycle of five minutes. This means that the fan will continue to run for between five and ten minutes after the dryer has stopped.