Lennox 51H7401 (51H74) Damper Gear Motor. NEW!! Old Stock!! Only 1 Available!! Genuine Lennox part. For many models: 78RGF, 78UGF, G17, G20. Message me with your model number and I'll verify it's for your furnace using LennoxPros.com. Also, be sure to check out my other HVAC products.