PVC/Riser grade versus Plenum grade Ethernet cable

[ilyaz]

I found about half a 1000ft roll of Cat 5 Ethernet cable. As far as I understand, it's

Space Shuttle
CAT5e
350MHz
24AWG
4 Twisted Pairs
Solid conductors

How can I find out whether it's PVC/Riser grade or Plenum grade cable?

thanks much

[AdamsSamoa]

Plenum should say so on the insulation....