new, as in new build houses will have vents in each room anyway! if its a new house to you, but a second hand house, you may not need to insert additional vent other than what's in the windows! judging from my own apt, regs seem to require as many vents as possible in each room....wondow vents, wall vents, door vents!!! our curtains move in front of the bleeding door vent in the french doors....thats what i call a draft, not ventillation!!!!