an air blowing system is disclosed having top and bottom air blowers that each includes a blower base and a blower housing tiltable relative thereto , and a coupling for enabling pivotable affixation of the top blower base to the bottom air blower , the air blowing system has at least first and second operational modes , whereby in the first operational mode the coupling does not affix the top blower base to the bottom air blower and the bottom and top air blowers are relatively independent , and in the second operational mode the coupling pivotably affixes the top blower base to the bottom air blower .