BIG ASS FANS Powerfoil X3.0 Guide D'installation Rapide page 3

3. HUB COUPLER
Attach Coupler to Static Tube
Tighten Coupler
Tighten Set Screw
FANS WITH TWO COUPLERS (POWERFOIL X3.0, POWERFOIL X2.0 ONLY)
If you received two couplers for your Powerfoil X3.0 or Powerfoil X2.0 fan, install the
SHORTER, WHITE coupler if your fan already has a factory-installed (non-removable)
static tube. Use the TALLER, BLACK coupler for all other installations.
#2
Tighten until snug.
Do not over-tighten.
1/8"
(3 mm)
Tighten until snug.
Do not over-tighten.