Epson EB-825 - Manual (Page 86)

Procedure
A
Open the air filter cover.
Slide the air filter cover open/close switch, and open the air filter
cover.
B
Install the Wireless LAN unit.
C
Secure the Wireless LAN unit using the screw included to
avoid losing the unit.
A Screw hole to fix wireless LAN unit
Installing the Wireless LAN Unit (EB-826W/825/85 only)
86