Central ventilation system should be best designed before new furnishing and installed in the mean time with central air conditioning system and/or under-floor heating system. For fully furnished space, we recommend you to consider installing simplified fresh air systems, which would not involve adding complicated air duct system all over, and re-structuring of the ceilings. It requires only digging a hole on the wall. As a combination of air purifier and central ventilation system, with air quality monitor, app remote control and supplement heating, AirProce SmartVent System is boasting a much better cleaning result than Indoor Air Purifier.