Deflecto Duct Increaser and Reducer, Plastic Inline Adapter, White, 4” to 3” (IRB43)
Product ID: 11466289
📏4" to 3" transition
🔥Durable up to 325°F
🛠️Easy installation
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🔧 Transform Your Duct Game!
The Deflecto Duct Increaser and Reducer (Model IRB43) is a lightweight, durable plastic inline adapter designed to seamlessly transition between 4" and 3" diameter ducts. Ideal for bathroom fan installations and dryer exhausts, it ensures a secure fit with easy installation, making it a must-have for any home improvement project.
| Brand Name | Deflecto |
| Model Info | IRB43 |
| Item Weight | 0.8 ounces |
| Product Dimensions | 4 x 3.4 x 4 inches |
| Item model number | IRB43 |
| Is Discontinued By Manufacturer | No |
| Part Number | DEFIRB43 |
| Special Features | Lightweight |
| Color | White |
| Connector Type | Reducer |
| Material Type | Plastic |
| Included Components | Deflecto Duct Plastic Increaser and Reducer |
| Batteries Included? | No |
| Batteries Required? | No |
R**A
Does the job
Used to decrease 4 to 3 inch exhaust fan duct. Perfect.
A**I
Works fine if you hot glue it
As others have said the 4 inch side is the same size as the 4" outlet duct on newer bathroom vent fans BUT I used a hot glue gun to essentially "weld" the two plastic pieces together. To assure a strong connection I wrapped the joint afterward with silicone self adhesive tape. I imagine duct tape would also work. The existing 3" flexible duct was a snug fit, but with a little effort it went over the 3" side of the reducer. I considered using a galvanized steel 3x4 duct adapter (Home Depot, Menards) but because of all the shower moisture being vented out I was concerned with the piece rusting over time. The plastic reducer was cheaper and will be rust-free.
D**G
Worked as described.
Worked as described. Was used to convert a 3in bathroom exhaust to a 4in. Pretty straight forward item.
P**E
Showed up fast and was priced right
It worked for what I needed, Showed up fast and was priced right
S**E
Did not work for me very well
The size if the reducer is the same size as the flex duct. I had to cut the duct for it to slide over and then use duct tape to keep together. On the fan side, it was also the same size. I did not have the option to cut. So I have to be creative. :(
T**D
Handy adapter!!!
Awesome little adapter, It bridged the gap perfectly!!! I wasn’t paying attention when I ordered my vent and got a 4” one when everything else I was using was 3”. Very easy to install.
J**P
This doesn't work as a reducer
I bought this to take the 4" output of a bathroom exhaust fan to a 3" flex duct. Even though it is sold as a reducer, the 4" diameter is exactly the same as the fan output and the 3" diameter is exactly the same as the flex duct - Nothing slides onto anything!
D**H
Awesome
Fits perfect
Trustpilot
2 days ago
1 week ago