Termidor SC cannot be applied indoors or for flea control. We do carry an Indoor Flea Kit that will be great for this application. You will vacuum daily (discarding the bag or emptying the canister after each use) and spray once every two weeks. It is highly recommended to make a minimum of two applications indoors but may require additional applications depending on the level of fleas.
We actually recommend, if possible, to apply Termidor in a trench inside the crawl space. You will use the same method as you do around the entire structure.
Your treatment should not be done within 24 to 48 hours of any rainfall for the best results. Your trench should be 6'' wide, 6'' deep and 10 linear feet along the structure with the Termidor. You can take a look at our site on How to Do a Termite Treatment to give you the proper application instructions for the best results.