SBM XFR Series Installer's Instructions page 9

 Examples of fixtures to be supplied by the installer :
XFR 48-2 = XFR 24 + XFR 24 + (2 XFR 24) BEAM
XFR 64-2 = XFR 32 + XFR 32 + (2 XFR 32) BEAM
If heaters will be fit with ballon grids, grids must be mounted
before the 2 heaters assembly. (see 2.6 page 14)
1
+
(2 XFR 24) BEAM
(2 XFR 32) BEAM
9