Is putting modem in a small cabinet a fire hazzard?

Our modem can only be put in a room where someone sleeps.

The lights on our Cisco phone/internet modem are too bright.  The lights are seeping out the vents.  There is no other solution but to put the modem in a smaller cabinet.

The cabinet is made out of wood and is an octagon.  It is about 2' x 2' x 3'.

If we were to leave the cabinet door open about 3 inches would putting the modem in there be a fire hazzard?

I was told the operating temperature of the modem is 32˚ to 104˚F (0˚ to 40˚C).

It is a Cisco DPC 3212.