  We analyze the modular properties of the effective CFT description for Jain
plateaux corresponding to the fillings nu=m/(2pm+1). We construct its
characters for the twisted and the untwisted sector and the diagonal partition
function. We show that the degrees of freedom entering the partition function
go to complete a Z_{m}-orbifold construction of the RCFT U(1)xSU(m)$ proposed
for the Jain states. The resulting extended algebra of the chiral primary
fields can be also viewed as a RCFT extension of the U(1)xW(m) minimal models.
For m=2 we prove that our model, the TM, gives the RCFT closure of the extended
minimal models U(1)xW(2).
