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

$5.85 /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 used on a 4" metal corrugated tubing coming from a dryer going into the 3" wall connection?

Asked by: Ravekiddcdz
The 4 in. dryer exhaust connection should not be reduced even though it may fit. Dryer performance will be degraded.
Answered by: Dave
Date published: 2016-12-06

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

Asked by: don
Yes, that's effectively what I did.
Answered by: Dave
Date published: 2016-12-06

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: 2016-11-23

What is the ID of the 3" side?

Asked by: tim
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Customer Reviews

4 in. To 3 in. Round Reducer is rated 4.5 out of 5 by 29.
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 5 out of 5 by from just what I needed for the project I was working on. Too bad they don't make a 4" to 2" reducer just what I needed for the project I was working on. Too bad they don't make a 4" to 2" reducer
Date published: 2017-02-21
Rated 5 out of 5 by from The product was fine it just didn't end up fitting where I needed it to so had to return it. The product was fine it just didn't end up fitting where I needed it to so had to return it.
Date published: 2017-01-18
Rated 5 out of 5 by from Perfect Fit This thING works great when upgrading your bathroom's air extractor. It's plug and play
Date published: 2016-12-06
Rated 1 out of 5 by from The reducer sold at the Home Depot is not made... The reducer sold at the Home Depot is not made like the one in the picture.
Date published: 2017-01-17
Rated 5 out of 5 by from Met expectations connecting 3 in. ceiling fan to 4 in. duct to roof jack. Met expectations connecting 3 in. ceiling fan to 4 in. duct to roof jack.
Date published: 2016-12-06
Rated 5 out of 5 by from Extractor Fan This part let me install a bigger fan while using existing exhaust pipes.
Date published: 2016-11-23
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