When an infestation gets too large for ordinary spray-on pesticides, it's time to bring in Fortefog Fumers. Like a smoke bomb, these small tubs release a deadly cloud of smoke which will kill pretty much all types of insects and pests. Simply light with a flame and vacate your room - the Fortefog Fumer will produce its smoke for about 30 seconds, filling the area quickly. After approximately two hours, the area will be safe to enter again. Any plants should be removed from your room or tent before using Fortefog Fumers.