Removing Seemingly Dead Oracle (Grid) Homes

We are getting ready to patch our ODA systems from 2.7/2.8 to the current version but we need to make room on u01 as we are running out of space:

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroupSys-LogVolU01

                            97G   79G   14G  86% /u01

[root@xxxxxa11 app]# ls -l

total 24

drwxr-xr-x  3 root   oinstall 4096 Jul 21  2012 11.2.0

drwxr-xr-x  3 root   oinstall 4096 May 10  2014 11.2.0.3

drwxr-xr-x  3 root   oinstall 4096 Oct 15  2014 11.2.0.4

drwxr-xr-x 11 grid   oinstall 4096 Oct 15  2014 grid

drwxr-xr-x 10 oracle oinstall 4096 Oct  1  2012 oracle

drwxrwx---  5 grid   oinstall 4096 Nov 17 14:21 oraInventory

It appears that the files in 11.2.0 and 11.2.0.3 are not being used.  I have tried various renditions of fuser/lsof and also checked any log directories in these and none have been updated for months.  I know for a fact our grid stuff runs from 11.2.0.4/grid and the databases out of oracle/product/*.  11.2.0 and 11.2.0.3 contain grid homes that appear to not be in use.