... same time, it can ensure that tht fresh air and exhaust air are completely separated, avoiding the cross pollution.Benefit ... recovery ventilator)◊ Brings a continuous supply of fresh air, filtered outside air into the home◊ Suck indoor environmental contaminants for ... back outdoors.HOLTOP ERV(energy recovery ventilator) suitable for machine room,for classroom, conference room, hotel lobby etc.Holtop ...