I discovered that my home's overhead stove vent doesn't actually vent to anywhere. So I've pulled out the old fan, purchased a new, more powerful fan with 1000 CFM, and then added 8" pipes through the attic. These pipes travel about 10 ft and will exit out an 8" hole out the front siding of the house, in the second floor. What type of product do I buy to allow the air to vent, without letting in much cold air, bugs, and mice?

I think this gooseneck product might be good, but the promotional flyers with it show that installed on the roof, and they don't show a solution exiting out the siding of the house.