Core size(mm): 400mm*748mm*56mm? 15.75″ * 29.45″ * 2.2″ ), Overall size(mm): 546mm* 779mm ( 21.5″ * 30.67″ ), Inlet/Outlet(mm): 34mm / 40mm ( 1.34″ / 1.57″ ); Note:Please check the pictures and dimensions carefully before purchase;