#1 Home Improvement Retailer

Internet #100112513

Model #RD3.25X14X36

Store SKU #939084

Store SO SKU #1000685444

3.25 in. x 14 in. x 3 ft. Half Section Rectangular Stack Duct

$1233
  • Used for HVAC systems or range hood venting between wall studs
  • Durable galvanized steel construction
  • Notched corners to easily connect sections
Store
0 in stock
Text to Me
caret

Product Details

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)
  • Return Policy

Additional Resources

From the Manufacturer

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.
caret

Specifications

caret

Questions & Answers

2Questions
caret
Q:Can these be put together in a way to allow the duct to be taller than 3.25"?
by|Aug 23, 2021
1 Answer
Answer This Question

A:  No, these are designed to be used as a single height. If you have any other inquiries about our Master Flow products please email warrantyllbp@gaf.com or call Technical Services at 800-211-9612, Mon- Fri, 8 am 5 pm EST.

by|Oct 21, 2021
    caret
    Q:Do I correctly assume that this item is a single piece (half section) of 3-1/4"x14"x3', and two s...
    by|Sep 7, 2017
    4 Answers
    Answer This Question

    A:  Correct, these are sold in "half sections" If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.

    by|Sep 8, 2017

      A:  Yes, this is a single piece.

      by|Sep 8, 2017

        A:  It is as described Half section and you need two to make the pipe.

        by|Jul 30, 2019

          A:  yes

          by|Apr 4, 2018
            Showing 1-2 of 2
            caret

            Customer Reviews

            3.8 out of 5
            (16)
            • 3.8
              out of 16 reviews
            • 33%recommend this product
            Filter by:
            Showing 1-10 of 16 reviews
            by
            • Verified Purchase
            Not 14" Duct -- It's 14-1/4"!!!
            The material and construction is fine, and were it not for the 1/4" oversize in width (it's actually 14-1/4" wide, not 14") I would have rated it 5 stars. Unfortunately, that extra 1/4" has created a BIG problem for me because it won't fit in between my floor joists, which technically should be 14-1/2", but vary slightly. Also, once you add the required cleats to connect the sections the duct becomes over 14-1/2". WHY ARE THESE DUCTS NOT SIZED PROPERLY???
            by
            Response from Master FlowSep 30, 2022
            Thank you for the feedback. Glad you were satisfied with your Master Flow purchase and we value your concerns. MasterFlow
              Misleading dimensions
              The measurements I needed were critical. 3.25"x14" would have been perfect. When I got the delivery, some of the sections were labeled as 14 1/2" wide, others were 14 5/8" wide. Im sure the product itself was fine, but the dimensions that are provided here in the listing are not precise or accurate.
              by
              Response from Master FlowApr 28, 2022
              Sorry for your experience. We have not had poor results from this product although we would like to thank you for your concerns. MasterFlow
              • Verified Purchase
              1 found this review helpful
              This product was not acceptable. The two halves would snap together but would not lock together s...
              This product was not acceptable. The two halves would snap together but would not lock together short of screwing the two together which is what I had to do. I will look for another product the next time I need this ductwork.
              by
              • Verified Purchase
              This had to be special ordered, but the duct came...
              This had to be special ordered, but the duct came quickly. Parts were in good shape and provided the shape and capacity I wanted for air flow.
              by
              • Verified Purchase
              Rating provided by a verified purchaser...
              Rating provided by a verified purchaser
              by
              • Verified Purchase
              Rating provided by a verified purchaser...
              Rating provided by a verified purchaser
              by
              • Verified Purchase
              Ok for the price. Did the job....
              Ok for the price. Did the job.
              by
              • Verified Purchase
              Every piece was bent on the ends. ...
              Every piece was bent on the ends.
              by
              • Verified Purchase
              The Master Flow 3.25 in. x 14 in. x 3...
              The Master Flow 3.25 in. x 14 in. x 3 ft. Half Section Rectangular Stack Duct was fine. Unfortunately, Home Depot did not carry fittings of this size so I had to order them from another retailer.
              by
              • Verified Purchase
              1 found this review helpful
              Showing 1-10 of 16 reviews

              Frequently Bought Together

              +
              +
              Price:
              $1233

              Compare Similar Stack Ducts

              current product
              3.25 in. x 14 in. x 3 ft. Half Section Rectangular Stack Duct
              Best Seller3.25 in. x 10 in. x 3 ft. Half Section Rectangular Stack Duct3.25 in. x 10 in. x 5 ft. Half Section Rectangular Stack Duct3.25 in. x 14 in. x 5 ft. Half Section Rectangular Stack Duct
              BrandMaster FlowMaster FlowMaster FlowMaster Flow
              Name3.25 in. x 14 in. x 3 ft. Half Section Rectangular Stack Duct3.25 in. x 10 in. x 3 ft. Half Section Rectangular Stack Duct3.25 in. x 10 in. x 5 ft. Half Section Rectangular Stack Duct3.25 in. x 14 in. x 5 ft. Half Section Rectangular Stack Duct
              Price
              $1233
              $1538
              $1584
              $1798
              Ratings
              (16)
              (111)
              (62)
              (14)
              View ProductView ProductView ProductView Product