Model # DTTB15

Internet #202191807

Store SKU #391823

Store SO SKU #1000684374

Master Flow 15 in. Ductboard Triangular Terminal Box

Master Flow

15 in. Ductboard Triangular Terminal Box

  • Pre-cut for easy installation
  • R6 ductboard insulation
  • FSK reinforced backing
$2297 /each
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Frequently Bought Together

Product Overview

Improve your heating, ventilation and air conditioning duct system by installing this Master Flow 15 in. x 13 in. Ductboard Triangular Terminal Box - R-6 that features an insulated fiberglass design. Insulated ductboard for improved temperature regulation.

  • Fiberglass material for durability
  • Insulated ductboard for improved temperature regulation
  • Minimum temperature rating of -25°F
  • Ductboard boxes help to eliminate system noise, have a high thermal efficiency, and when properly sealed with mastic, result in less air leakage
  • Always seal seams with code approved mastic or sealant (or duct tape), not included
  • Pre-cut for easy assembly using approved foil tape
  • R6 insulating value results in higher thermal efficiency for ductboard products

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Length (ft.)
1.08 ft
Product Thickness (in.)
1.5 in
Product Width (in.)
15 in


Insulation R-Value
Insulator material
Maximum air flow (CFM)

Warranty / Certifications

Certifications and Listings
No Certifications or Listings

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Customer Questions & Answers

Does this box have a bottom, or is it an open hole?

Asked by: Duke
Thank you for contacting MasterFlow ... This item is closed on all sides, like a box. Please call Technical Services Group at 800-211-9612 with any additional questions.
Answered by: Master Flow
Date published: 2015-09-20

What is the max size duct?

Asked by: Wllhgh765
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Customer Reviews

15 in. Ductboard Triangular Terminal Box is rated 4.3 out of 5 by 3.
Rated 3 out of 5 by from Not exactly what I expected. YOU MUST BUILD THIS YOURSELF - NOT ASSEMBLED ! ! ! I should have read the extremely fine details that were hidden from plain view. You must fold this box together and then tape it closed. I wouldn't usually complain about this, but I also had to cut down the inside of the bends as well. The angles were cut to be 90 degrees, not made for a triangle.
Date published: 2016-08-16
Rated 5 out of 5 by from Outstanding product, quality Outstanding product, quality exceeded expectation. I've bought 4 of these boxes and would buy again. Excellent price.
Date published: 2013-09-25
Rated 5 out of 5 by from Simple to build and works great Built the box in about 10 minutes. Then cut in my take offs needed for my project. Good R-value to the box and forms a nice air tite box
Date published: 2012-04-10
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