Draft Blocker - 6'' Inch Backdraft Damper Duct - Draft Stopper - Backflow Preventer - Inline Fan Vent - Vent Deflector (6'' Inch)

Excellent! Really easy to fit into the duct in my crawl space. I need to make sure that the duct is closed when not in use to prevent critters from entering. The damper opens out easily when air is being blown and otherwise stays closed. It opens in one direction, so nothing can enter from the outside into the duct when the damper is closed.

fast shipping, good product

Listing showed it to be black and came in plain aluminum but did a quick black spray paint on it.Needed for outdoor draft off of Jen-Air stove.

My new range hood

Fits exactly where I needed it too.

I ordered two of these from the same seller. They both are wrapped in a cardboard sleeve. One was shipped in a box but the other sent in a plastic envelope. WTF??!Guess which one came warped and damaged?This is a criticism of the seller/shipper. The intact product seems very nice and fits securely within the HVAC duct. The flaps will open with the slightest breeze (one way) and stay firmly closed against a foam seal on any backdraft. I am so very pleased with the one unit that arrived undamaged that I am ordering a replacement for the damaged one from the same seller while sending the damaged one back.The product: highly recommend.The seller: mmm, we'll see.

it was easy to install in 6" flexible ducting. Appears to work fine.

Overall good but the foam gasket needed to be realigned for a better seal as whoever stuck the gasket on must have been imbibing on too much vodka (since this is made in Russia per label).