Every morning at about 4:30am my alarm clock goes off to get me to work. almost every morning this also wakes up my sister downstairs. I would like to stop waking her, but I am very hard to wake up in the morning so I need a loud alarm. I'm thinking of getting some sound absorbing foam and using it as a big floor mat, but I feel like a lot of the sound is going through the floor vent. Does anybody know of a way to make a vent soundproof without creating a fire hazard, and without having to rip out the floor or ceiling? I live in Ontario in case there are any specific rules I need to follow. Any other sound proofing tips would be great as well!