guys i m new member in hvac talk .com,i like to keep on touch with all of you .i work at national place eng i m the hvac engineering inside the building i like to learn more and we can share all information about this field also i do refrigeration i gruaduate from morocco it s north africa thermo dynamic hvac and refrigeration i speak french,i m still at school in washington dc i do have 10 years experience plus 10 certificate from national power engineering