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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Frequently Bought Together

Installation Options

Product Overview

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

Product Overview

  • Used to increase or decrease pipe size
  • Durable galvanized steel construction
  • Can be crimped if needed
Model #: R4X3
Sku #: 148814
Internet #: 100149942

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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Specifications

Dimensions

Product Depth (in.)
4
Product Height (in.)
5.5
Product Width (in.)
4 in

Details

Brand/Model Compatibility
Universal
HVAC application
All HVAC types
Product Weight (lb.)
0.33lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
Free from Manufacturer Defect at Time of Delivery.

Specifications

Dimensions

Product Depth (in.)
4
Product Height (in.)
5.5
Product Width (in.)
4 in

Details

Brand/Model Compatibility
Universal
HVAC application
All HVAC types
Product Weight (lb.)
0.33lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
Free from Manufacturer Defect at Time of Delivery.

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
Yes Ues Dryer duct tape https://www.homedepot.com/p/Nashua-Tape-1-89-in-x-30-yd-Dryer-Vent-Installation-Tape-1390801/207203955
Answered by: gford
Date published: 2017-11-13

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

Asked by: Don
Yes. You might want to check your local building code, some localities frown upon reducing flow. Specially on pipe that carry hot air.
Answered by: Bulan
Date published: 2017-12-05

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

Can this be used to connect a 3-inch house vent pipe to a 4-inch dryer duct? I just bought a new ...

Can this be used to connect a 3-inch house vent pipe to a 4-inch dryer duct? I just bought a new dryer which includes a 4-in duct. I also bought a flexible dryer duct 8-ft x 4-in to transition to the house vent pipe that goes outside. however that house vent is 3-in wide, so i hope this can connect them together. And since the house vent pipe and the reducer are both exactly 3 inches wide, do i crimp the reducer so it fits inside the vent pipe?
Asked by: Kay
This can be used for that.
Answered by: CommunityAnswer
Date published: 2017-08-23
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Customer Reviews

4 in. To 3 in. Round Reducer is rated 4.5 out of 5 by 75.
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 1 out of 5 by from This reducer was for a bathroom vent fan. It had... This reducer was for a bathroom vent fan. It had a 4” outlet that went to a 3” vent pipe. The reducer wouldn’t go over or into the fan housing and l had to cut cut the 4” end all the way around to flare it out and then duct tape it all around. I’ve installed these before and never had this problem.
Date published: 2017-12-20
Rated 3 out of 5 by from Not even remotely like the product pictured (actually a 12"... Not even remotely like the product pictured (actually a 12" tapered tube). Works for my application, but not ideal. Took three associates to tell me what I really came for was out of stock (online site indicated otherwise) - go to a real hardware store.
Date published: 2017-12-20
Rated 2 out of 5 by from It looked nothing like the photo. The actual reducer... It looked nothing like the photo. The actual reducer is much longer and wouldn't work in my space. Guess I won't go to the trouble to return it though.
Date published: 2017-10-17
Rated 4 out of 5 by from I was taking my dryer duct from the dryer to... I was taking my dryer duct from the dryer to a 4 inch round hole and the reducer did just what I needed it to do. Thanks
Date published: 2017-12-12
Rated 4 out of 5 by from Served the purpose to install a vent fan. Lost some flow since going to a smaller duct but worked... Served the purpose to install a vent fan. Lost some flow since going to a smaller duct but worked well.
Date published: 2017-12-05
Rated 5 out of 5 by from Worked as advertized. Good fit and good quality. Will buy the aame if needed. Worked as advertized. Good fit and good quality. Will buy the aame if needed.
Date published: 2018-01-17
Rated 5 out of 5 by from Worked great to reduce bathroom exhaust fan to the existing... Worked great to reduce bathroom exhaust fan to the existing 3 inch
Date published: 2018-01-02
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