Sapphire R7 260X FAN duct for PCI-E x1 riser

Duct for 'Sapphire R7 260X ' VGA.
(AMD Radeon R7 260X VGA card)

• What is this?
  This VGA uses two slot dimension.
  And original duct blocks one left PCI-E slot.
  My duct make a room for PCI-E 1x slot extension riser card like above photo.