Damper regulator 1,Damper quadrant handle for HVAC system,suitable for round or square ducts 2,Handle round/square size: ... 12MM,10MM,L=125,150MMGalvanized100 1Damper quadrant handle for HVAC system,suitable for round or square ducts2Handle round/square size:12 ... .2mm,12.5mm3It's avaiable for round or square spindle4Finsh:galvanized ( function(){ var aBigImageSrc = [ ' ...