Alpine TR Aerosol is a fogger. It will only help to eliminate the fleas that are out in the open at the time you set it off. Please refer to our guide here on how to more effectively eliminate fleas. For outside we do have a great Outdoor Flea/Tick Kit that would be used.
The Alpine TR Aerosol label states to vacate the treated house, room, apartment for at least 2 hours. After 2 hours, you may re-enter to the area to ventilate my opening windows, doors, and vents. Allow time for room to air out, then it is ok to re-enter. If odor is still detected, additional ventilation may be required.
