Hi all, I am constructing a new bathroom in my home within the existing square footage. It is fairly small (5x9). I would like to put an HVAC outlet vent into the room. There is an existing duct that rooms to one of the bedrooms very closeby in the attic. I was hoping to simply Tee off of this line and go into the new bathroom. I don't think there will be heating or cooling capacity issues since I am not adding square footage. Are there any issues I should be aware of? I am in California and my city uses the state code with no modifications.