RK 6" Professional Backdraft Shutter Damper Connector Duct Fits Only with Metal Ducts

Excellent duct damper. I order and received a different 5" damper bade by ECOPRO originally but there were two springs on the 5" damper flaps, and it took quite a force to push open the flaps, so I ended up returning that and ordering the Neverest® RK 5" Backdraft Shutter Damper. The damper opens with a minimal amount of pressure and the quality of the unit is great. My issue was that we have a down draft cooktop and when there was a descent amount of wind outside, we would get a flow of cold air (IT was in the early spring) blowing out the downdraft grill on the cooktop, so I needed to prevent the wind draft from blowing into the ducting from outside. I installed the Backdraft Shutter Damper in a 5" metal flexible duct, and it took about 45 minutes from start to finish to complete the job. Now even with the slightest outside breeze the damp shuts and does not allow any draft into the house!

Good Quality- Worked for City Code Inspection Requirement for outdoor Commerical Dryer. Install straight forward with arrows as directed for flow / operation of ducting flapper. Installed with very short sheet metal screws to prevent lint build up inside ducting. Can be installed with hose clamps if non city code requirement.

This has two springs. I ended up removing one of the springs to make it open easier. The foam lip had a small gap I just taped up. It installed easily and fixed the backdraft from our stove top.

I had two vents that were banging very loudly when it was a windy day. My vent for the hood over my stove was 5" and the other vent (from my dryer) was 4". So, I am glad I purchased both sizes. Don't assume you know the size. Anyways, these work GREAT. I do have a plastic cover that hides them from the outside, but all of that terrible banging has stopped. Occasionally, I will hear them open and close, but they are much quieter due to the rubber seal inside. Great product and builders really need to install these instead of those loud clanging plastic ones! Thank you for a great product!!

For years my kitchen exhaust was extremely cold Air coming in cold from vent through the 2 car garage about20 feet of 6 inch vent Anyway quick install on flexible and rigid( perfect fit. No cutting or crimping) taped with aluminum tape done! No back draft at all. Thank you makers of this product !

This product did a good job is helping with the draft.

Very prompt - it was on time and the driver was very professional and friendly. It was what I wanted - great quality

I don’t understand the high reviews. From reading a few I’d saw the high reviews were for larger sizes. This review is for the 4 inch version which clearly doesn’t deserve a ton of stars. I like that it is only about 4 inches long and if you have a weak fan and not much wind the fact it only has 1 flapper spring may be an advantage for you. However compared to a much cheaper competitor (though 5 1/2 inches long) also on Amazon this unit is a terrible value and I returned it. Specifically: - despite seller’s statements it is not a sturdily made unit. - only has 1 flapper spring and I don’t want to hear it banging in the wind. Others have 2 springs. - photo in Amazon listing shows a removable pivot but the unit I received is not removable in case maintenance is needed later on. For this price it needs to be fixable i.e. removable. - neither the housing nor flapper are accurately made so to fill the gap a very wide foam gasket is glued in there for flapper to seal against. It seals well but the problem is that the huge gasket cuts the airflow area by nearly 60%! O.D. by the way is 3-7/8” so should easily fit 4” ductwork.

Muy buen producto, cumple su función a la perfección, sin embargo solo debe utilizarse en horizontal, no apto para usarse verticalmente.

Diamètre respecté mais ressorts un peu forts

Qualität ist absolut einwandfrei. Öffnet schon auf Stufe 1 meiner Abzugshaube. Ist zwar etwas kleiner als der Rohrinnendurchmesser, dafür passt es aber rein und kann ggf. mit Panzertape ausgeglichen werden. Ich bin damit sehr zufrieden.

Facile à installer, fait le job, reste à voir sur la durée.

Enl spec. Snabb leverans