For sealing the connections between various parts of the vent system, metallic foil tape ought to be utilized (instead of screws). The foil tape will deal with high temperature levels and continue to be intact.Specialized hoods ought to be used to top off completion of the line exterior. These hoods will shut out any potential bugs, but will allow optimal airflow for ventilation.
Dryer Vent Wizard of Elmhurst Gives Recommendations on Dryer Vent installations