Home ventilator is Uni-Flow wall mounted ventilator. It can only bring in fresh outside air, and filtered it even preheated it if necessary. Mainly to supply fresh air to the indoor area. The ventilator use at home also needs to dig a hole on the wall. When bringing in fresh air, the house will be under negative pressure. And stale air will be pushed out from the door and window gaps. Or we can also add exhaust fans in washing room or kitchen.