I'm about to move a gas-fired clothers dryer vent through the wall of
my basement (it was blocked off due to a deck the previous owner
installed). Just want to make sure this is safe:

Down from dryer in flexi metal 4" pipe. Along a series of 2' long
galvanized sheet metal ducts held together with screws that stick
through to the inside of the pipe (catching lint?), through a 90 and
then out through the wall and a plastic louvred vent under a wooden
deck. Ducting to be strapped directly touching the floor joists with
metal strapping nailed to joists.

Ok?

Thanks for any tips if this is dangerous.

Dean