My house has several transfer grilles like this:
Except they have no baffles inside them, so light and sound come through into our bedrooms quite easily. I'd like to put in a sound maze like this to block light and sound:
My concern is that I will be restricting air flow enough to impact the HVAC system's effect on these rooms when the door is closed. Is that a valid concern, and if so, what considerations should one make to maximize air flow through a sound maze like this?