Range hood question

[Bigventure]

Hi, I have a 65 Caravel.

I know what the original range hood looks like and how it operated. Mine was rust out, totaled and had no guts. I salvaged the angled box and the 5" round that goes out. It's been blasted and repainted. I purchased a new modern hood. Blanked the back vent and cut a hole in the top to fit the angled box.

So this is my question. How would you prevent a backdraft? A flaper like a dryer vent? A loover on the outside? Any other ideas?

Thanks, Dave

[Homewrecker]

good question. my range hood seems intact and it doesn't have anything to keep backdrafts from occurring. (totally open) There was a hornet nest within the outside vent cover, after years of the trailer sitting abandoned.