A Metal Halide, florescent, or specialty bulb may flicker and turn off during the first 100 hours burn in period. A normal house hold bulb may acturally burn filiment off the outside of the glass as well. Let everything cool down and restart.
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The exhaust outlet is the point where air is discharged through the body of the fan housing into the ductwork. During installation, orient your fan with the exhaust outlet pointing toward the exit vent on your roof or wall to minimize turns in ductwork that impede airflow.