Do not hire these contractors for any commercial jobs. I have just had the worst experience of my life dealing with Amir and his company. They always found a fault somewhere else and not in the quality of work they did. They are not qualified to work on any commercial ductwork and cut corners wherever they can. They don't even know how to properly install the rooftop HVAC unit. I had to get some other contractors in to fix the mess they made. I am lodging a formal complaint against them as well.