  The present study is motivated by the study of reference [1], where the
generalized second law of thermodynamics has been investigated for a flat FRW
universe for two viable models of $f(T)$ gravity. In the present work, we have
considered a non-flat universe and accordingly studied the behaviors of
equation of state parameter and deceleration parameter. Subsequently, using the
first law of thermodynamics we derived the expressions for the time derivative
of the total entropy of a universe enveloped by apparent horizon. In the next
phase, with the choice of scale factor pertaining to an emergent universe we
have investigated the sign of the time derivatives of total entropy for three
viable models of $f(T)$ gravity.
