GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Good options for inline dampers on rigid supply duct ?

Aston01 | Posted in Mechanicals on

In the past, I have used basic inline dampers on rigid supply lines and while they work for the purpose they generally feel fairly cheap, the adjustment plate holes leak and the wingnut locking system doesn’t inspire a great deal of confidence.

I would like to find something better than my current option (above), but considering this is on a balanced residential system it doesn’t make sense to pay a great deal for something that will likely be adjusted once and hopefully never touched again.

Has anyone seen something that is better than the above but isn’t $100+ ea for 4-6in ducts?

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Expert Member
    Akos | | #1

    If its in a round register, you can look at adjustable butterfly dampers. These typically adjustable only through a hole in the grill.

    There are also iris dampers, much better precision and solid adjustment. Not cheap.

    Really hard to justify much more than a standard duct damper.

  2. aunsafe2015 | | #2

    From the pictures, those appear to be higher quality than the standard dampers that attach with holes and wingnuts. That said, they also cost $100+. Not really sure they would be so much better as to be worth the cost.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |