Thanks Dave, I am cautious, I clean out the dryer tube and the ducting in the dryer too Thank you for the input BB Thank you Chris, and I will use the shiny silver tape like yooperdave advised. I just had a very educational conversation with a man in MA. Nelson Warner at Tamarack Technologies, he was so kind and explained how high winds affects pressure outside vs pressure inside the house, and some or a lot of the flapping from my dryer vent is my house equalizing, not just the wind pulling it open. He talked about air quality too, I no longer regret sending the warm moist air out the vent instead of breathing it in here (leads back to chris mentioning the dryer sheets/lint glue I get on my dryer lint trap as well). I am buying one of these, outside vent TBD.
Bill, I am googling the shuttle type, the only ones I see are top flap, could you link me up? Scratch that, found it, thanks! That and the back draft sleeve if the wind lifts the float