I don't have a IR fogger but they try to keep them as cheap as possible and try to use as many common parts as well. You need to do a little research. Making sure the machine is unplugged, take the cover off and see how the it is wired to the IF control on the top. If you can take a picture and post it would help. Check the wire coming from the on/off switch going to the IR function. If there are three wires green, white and black, going to the IR board then you can splice the timer to that. If you've ever wired an outlet you should be able to handle it. Note, leave enough wire at the ends to be able to put it back in case it doesn't work.
Note; someone else on this forum recommended for a cheap fogger, Spencers fog machine, because it already comes with the timer unit
Note; someone else on this forum recommended for a cheap fogger, Spencers fog machine, because it already comes with the timer unit