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3.25 in. x 12 in. x 5 ft. Half Section Rectangular Stack Duct

  • Used for HVAC systems or range hood venting between wall studs
  • Durable galvanized steel construction
  • Notched corners to easily connect sections
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Product Overview

Master Flow's Rectangular Stack Duct is used for HVAC system applications between wall studs as supply and return ducts, and to vent range hoods, kitchen and bath fans between walls as well . Installing rectangular duct between wall studs saves space, and is an easy way to route air up or down a wall and to other stories of a home. It also works in overhead spaces between floor joists or in attics. Sold in "L" sections. Two pieces must be ordered to produce a full section of duct.
  • Sold in Half Sections - 2 pieces needed for complete section of duct
  • Sections easily snap together with no tools necessary
  • Can be cut to needed length with simple tin snips (not included)
  • Notched corners for easily connecting sections, or use cleats (cleats not included)
  • Always seal seams with code-approved mastic, sealant or duct tape (not included)
  • Install with sheet metal screws (not included)
  • Always insulate ductwork for greater system efficiency and comfort

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Length (in.)
3.25 in
Product Width (in.)
3.25 in


Duct Type
3.25 x 12
Galvanized Steel
Zinc Coated

Warranty / Certifications

Certifications and Listings
No Certifications or Listings

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 4
    out of 6 reviews
  • 67% recommend this product
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Showing 1-6 of 6 reviews
Stack duct met expectations & works well....
Stack duct met expectations & works well.
  • Verified Purchase
Easy to put together. I used metal tape to hold...
Easy to put together. I used metal tape to hold it together at the seams.
  • Verified Purchase
It was easy to work with. However, it could have...
It was easy to work with. However, it could have been of a higher gauge.
  • Verified Purchase
Matched up well with duct work from the 40's
Matched up well with duct work from the 40's
  • Verified Purchase
  • Recommended
You get what you pay for I suppose.
When the 2 halves where aligned on a flat surface the cuts on the corners didn't align correctly. When the corner cuts where aligned, the duct was racked across the corners.
  • Verified Purchase
1 person found this helpful
i used this stack duct to cover a part of counter and it worked and looked great
i'm looking for other areas in the house to re-purpose ducts. they offer the feel of stinless at a fraction of the cost.
  • Verified Purchase
  • Recommended
Showing 1-6 of 6 reviews