Bombing house for Fleas?

both of my dogs have fleas..this is my first experience with the pesky bugs! I have done everything except for give them the pill Comfortis and bomb my house. That is my next step and my question… Does anyone know if I can keep my dogs in a room upstairs, while I bomb the down stairs.? My dogs do not have access to my upstairs so I am pretty sure there aren’t fleas up there. I was thinking of putting them in thier cages in my bathroom with door closed and closing my bedroom door..so they will be behind two closed doors upstairs. Thanks :)