Model # DSCF4

Internet # 100146818

Store SKU # 391305

Store SO SKU # 755578

4 in. Starting Collar Take Off

$3.68 /each

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Product Overview

The Master Flow 4 in. Starting Collar is suitable for most HVAC applications. It provides a transition from a flat surface like a plenum (made from metal, ductboard or insulated) to round pipe or insulated flexible duct. It can be used with ductboard, an internally lined or unlined plenum. This galvanized steel starting collar features extra-long tabs to fit most duct board thicknesses.

  • Connects round pipe or insulated flexible duct to a flat surface to start a duct run
  • Install with sheet metal screws (not included)
  • Fits most HVAC types for universal application
  • Can be used with an internally lined or unlined plenum
  • Extra-long tabs to fit most ductboard thicknesses through 1-1/2 in. (or R-6 value)
  • Seal seams with code-approved mastic, sealant or duct tape (sold separately)

Info & Guides

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


Brand/Model Compatibility 
HVAC application 
All HVAC types 
Product Weight (lb.) 
0.33 lb 

Warranty / Certifications

Manufacturer Warranty 
Free from Manufacturer Defect at Time of Delivery. 

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Customer Questions & Answers

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Customer Questions & Answers

4 in. Starting Collar Take Off
4 in. Starting Collar Take Off

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This question is from 4 in. Starting Collar Take Off
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Is the collar loose so it could slide down tight to a hole cut into sheet metal?

This question is from 4 in. Starting Collar Take Off
Asked by
Red Bluff CA
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December 4, 2015
I want to attach this take off to the top of a roof vent that I will cut a 4" hole into. If the collar is loose, I could put sealant around the joint and push the collar, acting as a storm collar, into it to protect the sealed joint from the weather. Thanks
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Customer Reviews

Rated 5.0 out of 5 by 1 reviewer.
Rated 5.0 out of 5.0 by Exactly what I needed! I decided to tackle the replacement of my entire duct system myself when the quote from the pro's was in excess of $3300, and going up to $4800 on April 1st because of the heat in FL. There was a junction box that fed the far side of the house that was obviously used as a seat by someone and was completely crushed with a big gash on the top, and there were two bathrooms being fed from that junction box, so after constructing the new box, I needed to install the new 4" starting collars to run the new ducts to each of these bathrooms (other rooms as well needed 6" starting collars). These were economical, sturdy, yet the tabs were easy enough to bend with my fingers to secure them to the new box. along with some mastic to seal and help them to stick to the box. The necks were long enough to easily slide the inner tube of the duct to, and the lip provided a great guide to get past to know where to secure it with the nylon zip tie, and make the fit snug enough not to slide off when I let go of it to wrap the zip tie on it and tighten it down with the tightening tool. I used the round neck and a sharpie to trace around it on the plenum fiberboard junction box I made to cut the hole to put the collar through. I made the box and put the collars through on my back porch, and they remained snugly in place as I navigated the box through the attic to its destination to then secure the new duct to it. I did this without gloves, and as one would expect from sheet metal, I encountered a few cuts, but I don't work well with gloves on - be mindful that the seams are sharp and can cut fingers! April 14, 2015
  • 2016-07-04 T17:12:09.595-05:00
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