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

  • Used to increase or decrease pipe size
  • Durable galvanized steel construction
  • Can be crimped if needed
$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

Info & Guides

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Warranty / Certifications

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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
Can it be used for 4 x 3 reduction? Yes. But a dryer vent should go to a 4 inch wall vent tp prevent back pressure and potential lint clogs than could result in a fire. The 3 inch penetration in the wall should be enlarged to 4 inches. The building code states that dryer vents should not be "restricted". Reducing from 4 inches to 3 inches would constitute a restriction so the safe, correct answer is "no".
Answered by: engr4you
Date published: 2017-06-09

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 is what I used it for when I installed a replacement exhaust fan in the bath. the old fan had a 3" exhaust going out the roof.
Answered by: David
Date published: 2017-06-06

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
4 inch end is an outside diameter and 3 inch end is an inside diameter. The assumption is that the airflow if from the 4 in end to the 3 in end although it is possible to reverse this and have satisfactory operation but not in a heating and cooling application.
Answered by: engr4you
Date published: 2017-06-09

What is the ID of the 3" side?

Asked by: tim
Yes.
Answered by: engr4you
Date published: 2017-07-18
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Customer Reviews

4 in. To 3 in. Round Reducer is rated 4.6 out of 5 by 49.
Rated 5 out of 5 by from The galvanized coating seems good and the seams appear to be well made. I didn't encounter any s... The galvanized coating seems good and the seams appear to be well made. I didn't encounter any sharp sheet metal that might result in a cut hand. Not much else to say about this item, however, there is a plastic alternative if you need a 4 x 3 inch reducer for a bathroom fan. It costs less but doesn't always seem to be in stock. Remember, the plastic option is not suitable for heating and cooling applications but is better where the humidity is very high in bathroom fan installations.
Date published: 2017-06-09
Rated 5 out of 5 by from Did the 4 in. To 3 in. Round Reducer meet my expectations? Indeed! For the 4 minutes I spent lovi... Did the 4 in. To 3 in. Round Reducer meet my expectations? Indeed! For the 4 minutes I spent lovingly inserting and taping this pro piece we were both deeply satisfied. I'm settled and at peace knowing that each and every day it continues to squeeze air from a larger duct into a smaller one, dutifully scuttling shower steam and particulate detritus into the open sky outside without so much as a micrometer gap.
Date published: 2017-06-07
Rated 5 out of 5 by from it worked for my 4 inch fan, I only had a 3 inch duct and there was nothing else I could do. it worked for my 4 inch fan, I only had a 3 inch duct and there was nothing else I could do.
Date published: 2017-05-17
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 5 out of 5 by from Worked well I purchased this to reduce the outlet size of a new replacement exhaust fan I installed in a bathroom. The fans are standard 4" but our existing ducting was 3". This item saved quite a bit of time, money and aggravation.
Date published: 2017-07-18
Rated 5 out of 5 by from It was almost what I wanted, except I needed a male end on the 3" side. Had to modify it to make ... It was almost what I wanted, except I needed a male end on the 3" side. Had to modify it to make it work. Wish they sold one with a male 3" end.
Date published: 2017-06-06
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
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