are engaged into the first and second pivot holes 2311 and 3110 to secure the air duct 30 to the drive bracket 20 the air duct 30 can be rotated between a first position shown in fig4 and a second position shown in fig6 in the first position the air duct 30 is rotated to position above the top wall 23 to uncover the subspace 203 of the drive bracket 20 and the locking tabs 313 are disengaged from the locking holes 2131 of the locking pieces 213 in the second position the air duct 30 is rotated to cover the subspace 203 of the drive bracket 20 the locking tabs 313 are engaged in the locking holes 2131 of the locking pieces 213 the shielding boards 33 abut the separating walls 29 of the drive bracket 20 to prevent air flowing out of the subspace 203 in a direction substantially perpendicular to the base board 31 referring to fig1 the electronic device enclosure in accordance with an embodiment further includes a first air guiding bracket 50 and a second air guiding bracket 60 the first air guiding bracket 50 is secured to the second sidewall 27 of the drive bracket 20 to enclose.