4-in HVAC Duct Manual Volume Damper with Sleeve - Galvanized Sheet Metal Round Volume Damper Airflow Ducting Branch, Adjustment Handle HVAC Air Balancing System - Easy to Install

Works very well project

Installed them in two of my three main hoses to regulate the hot spots in 3 of the 7 rooms. Have one set on around 25, the other on around 50 percent. Now even in the cold rooms I have an equal temperature within the whole house.Installation was easy, just cut the existing hose, tape both hose sides on each side of the damper element and put the insulation back on top (leave the handle a small cut out). Don't forget to mark it's positions before you install it (0/50/100%) and mark those on the reinstalled insulation.

Other reviewers have harshly criticized this piece of junk, but I ordered it anyway since I didn't want to spend twice the price for the next cheapest 5" inline damper assembly.In the immortal words of Obi Wan Kenobi,"This is not the damper you're looking for."Fabrication of this assembly is far worse than the worst crap from China I've ever seen, so if this was produced by an American company they should get what they deserve.Other negative reviews noted the hinge holes do not line up, and this is correct. But there are many more problems than that from the incompetent design and fabrication .1. The damper plate, as installed, will not and cannot open and close for reasons to be explained.2. Removing the damper plate completely (which is a chore for reasons to be explained) proves the damper diameter is almost 1/2" too small, which leaves a gap of almost 1/4" all the way around when the damper is in the closed position.3. The hinge bolts are incompetently attached to the damper plate, which means they stick out each side at significantly different angles. In other words, as supplied, the damper hinge bolts do not sit in a straight line, which apparently doesn't matter to the fabricator since the mounting holes are not even close to 180° apart.4. Removing the damper plate is a challenge because 1) the hinge bolts are not in a straight line, 2) the hinge bolts stick out a wild angles, and 3) the duct hinge bolt holes are really too small for simple damper plate removal. It can be done, but you'll probably bend the damper plate during removal.5. Once the damper plate is removed, you can more-or-less align the hinge bolts, but because of the design they WILL NOT fully align no matter how much you bend the plate's thin metal .6. With the damper plate out of the duct, it's possible to drill new hinge bolt holes in the duct 180° apart.Oh, but the fun's just beginning.7. Reinstalling the damper plate you'll see it more or less rotates as intended, but you'll also see the 1/4" gap between the damper plate and inside diameter of the duct. You can mitigate this with foam or whatever, but if you leave it as is, you'll still have considerable air flow through the closed damper.8. Now the final straw. The "bushings" and wing nuts for the hinge bolts can be fully tightened only by deforming the round cross-section of the duct, which makes the bypass air in the closed position worse.But wait, there's more.9. Because the hole in the damper lever for the hinge bolt protrudes is FAR too large, the lever CANNOT be securely attached to the damper plate, making opening and closing the damper a true adventure. The lever will move, but you have no assurance the damper is moving with it, and FOR CERTAIN the position of the lever is not the same as the position of the damper. As the result, you cannot know whether the damper is fully open or fully closed (which due to the design is actually impossible; see above).In my case, since I drilled the new hinge bolt hole near the original offset hole, it's possible to see inside the duct to check the damper's position. Originally I expected to permanently block the old hole with duct tape, but since it's necessary to use this hole twice a year when the damper is opened or closed, I just covered it with masking tape, which works fine.The operating lever has a hole in the end, which implies it can be connected to an automatic or remote actuator. However, the sloppy connection between the damper lever and hinge bolt INSURES the automated or remote actuator CANNOT move the damper to the desired position. With an automated or remote actuator the damper will never be fully closed or fully open; it will always be at some random position in between.Run, don't walk to a different product!

Get out the tape. Not a great deflector. Too much space between metal.

It was easy to install but the quality of material was low. However it was available unlike most in person stores. It does it’s job.

If you are going to adjust it often then you may need to do something about the handle to shaft connection. If it's going to remain set after it's been adjusted then it will be fine.

I have a 10 inch supply duct, which was larger than all the other ducts attached to my plenum -- and it was sucking all the airflow -- so rooms not connected to that duct were struggling to pump out any cool air. Local HVAC company quoted me $3k to replace my entire plenum. Instead, I ordered this damper and attached at the plenum-level for the troublesome return duct and, after some easy adjustment, problem solved!! Cold air is flowing in the rooms it was not previously and the whole system is much more balanced.

I purchased this for the threaded portion with the control handle. One in my home HVAC system broke while I was switching from summer to winter direction. Disassembled and attached to my damper and worked like a charm.