Model # R4X3

Internet #100149942

Store SKU #148814

Store SO SKU #1000684915

null 4 in. To 3 in. Round Reducer
0050206925508

4 in. To 3 in. Round Reducer

$585 /each

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Product Overview

Master Flow Round Reducers are used to decrease the diameter of the pipe when making connections in an HVAC system. Hemmed collar edges make these Reducers especially strong and snug-fitting. They can also be used to increase pipe diameter if necessary.

  • Hemmed collar edges improve fit and increase strength
  • Also used to increase pipe size
  • Galvanized steel construction
  • Always seal seams with building code approved sealant or duct tape
  • Always insulate ductwork for greater system efficiency and comfort

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Customer Questions & Answers

Can this be reversed and used as a converter from a 3 inch exhaust to a 4 inch exhaust tip

Asked by: don
no, its meant for the duct pipe to fit over it, and for the 4" end to press over the flange of the fan
Answered by: jz
Date published: 2017-05-17

Can this be used on a 4" metal corrugated tubing coming from a dryer going into the 3" wall connection?

Asked by: Ravekiddcdz
it probably would, the 4" end is a tight fit though. So you might have to make it fit
Answered by: jz
Date published: 2017-05-17

Are the collars on the 3 inch & 4 inch ends designed for inside diameter or ourside diameter?

I ask this question because I purchased a bathroom exhaust fan with a 4 inch diameter discharge. Home Depot conveniently had a plastic 3 to 4 plastic adapter right next to the ceiling fans. I liked that is was a short length. I only had to cut 1-1/2 inch of the rigid 3" exhaust line. It dry fit snug to the outside of the 3-inch exhaust. The problem was the 4-inch end of the adapter is exactly the same diameter as the 4-inch exhaust cowling coming off the fan. For a DIY market, that is not helpful. I used a No Hub Coupling to make the connection work.
Asked by: Brian
The four inch sits outside the exhaust flue. The three inch inserts into duct. This reduces Co2 chance of escape. Thus it is a four to three exhaust.
Answered by: UgoPro
Date published: 2017-04-27

What is the ID of the 3" side?

Asked by: tim
  • y_2017, m_5, d_23, h_2CST
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Customer Reviews

4 in. To 3 in. Round Reducer is rated 4.5 out of 5 by 42.
Rated 5 out of 5 by from I used it when I had to replace my old bathroom fan. The old one had a 3 in. exhaust, and the new... I used it when I had to replace my old bathroom fan. The old one had a 3 in. exhaust, and the new one was 4 in., so I used this to convert from the new fan exhaust to the old exhaust pipe in the home. I had no issues using it.
Date published: 2017-05-16
Rated 4 out of 5 by from This reducer worked to convert my bathroom ceiling fan to the vent. It is metal, but a bit flims... This reducer worked to convert my bathroom ceiling fan to the vent. It is metal, but a bit flimsy. At least it's not plastic!
Date published: 2017-05-02
Rated 5 out of 5 by from This is a simple, well functioning adapter. It does exactly what it says it will do. Easy to slid... This is a simple, well functioning adapter. It does exactly what it says it will do. Easy to slide on/off and inexpensive.
Date published: 2017-03-28
Rated 5 out of 5 by from Worked Imagine a 4 to 3 reducer that is what they say 3 inches on one side and 4 inches on the other. God bless America
Date published: 2017-03-21
Rated 4 out of 5 by from It does what it should do. I had to cut it down a little to get it to fit. It's expensive for w... It does what it should do. I had to cut it down a little to get it to fit. It's expensive for what it is.
Date published: 2017-03-01
Rated 4 out of 5 by from The reducer worked for what I needed it to but... The reducer worked for what I needed it to but I wish it was shorter. It is longer the it is pictured.
Date published: 2017-04-18
Rated 5 out of 5 by from I needed to connect a 3" exhaust hose to a 4" dryer vent for my kiln. It fit perfect, no problems. I needed to connect a 3" exhaust hose to a 4" dryer vent for my kiln. It fit perfect, no problems.
Date published: 2017-04-08
Rated 5 out of 5 by from The reducer shown is not the one I purchased. Mine... The reducer shown is not the one I purchased. Mine was cone shaped which made it easy to install.
Date published: 2017-05-16
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