Burning sulphur to naturally deter spiders and white ants. If I burn it - I have done this amny times its a?

when I had to flea bomb my house, the vet said it was OK to put a towel over the fish tank to block the noxious flumes from affecting the fish. Not sure if that will work with the sulphur as well, so I am curious to see what others have to say... Does it REALLY keep the insects out of your house?? I might have to try that...we get black widows occasionally and it stresses me out with the pets.