Product review (5 stars): ELIMANATES COLD AIR IN AND COMING FROM THE DRYER
THE FLAP ON MY OUTSIDE VENT NEVER CLOSED TIGHTLY.  AS A RESULT, COLD AIR ALWAYS CAME BACK DOWN THE VENT FILLING THE DRYER DRUM WITH COLD AIR, OR THE BASEMENT IF THE DOOR WAS LEFT OPEN.  AFTER INSTALLING THIS VENT MY PROBLEM WAS SOLVED.  IT WAS PRETTY EASY TO INSTALL AND REQUIRES VERY LITTLE MAINTENANCE.  THIS ALSO DOES A GREAT JOB OF KEEPING INSECTS AND SMALL CRITTERS OUT, SINCE IT SEALS  ITSELF EVERY TIME THE DRYER SHUTS OFF.