  In the context of the Standard model with a fourth generation, we explore the
allowed mass spectra in the fourth generation quark and lepton sectors as
functions of the Higgs mass. Using the constraints from unitarity and oblique
parameters, we show that a heavy Higgs allows large mass splittings in these
sectors, opening up new decay channels involving W emission. A Higgs heavier
than $ \sim 800 GeV $ would in fact necessitate either a heavy quark decay
channel t'-> b'W/b'-> t' W or a heavy lepton decay channel \tau' -> \nu' W as
long as the mixing between the third and fourth generations is small. This
mixing tends to suppress the mass splittings and hence the W-emission channels.
The possibility of the W-emission channel could substantially change the search
strategies of fourth generation fermions at the LHC and impact the currently
reported mass limits.
