AC Infinity

AC Infinity Duct Adapter 6 to 4 Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems

1062+ bought in the past month

$21.99$25.99

About this item

  • A ducting cone designed for adapting ductwork to equipment like bathroom fans and dust collectors.
  • Maintains airflow efficiency by creating a connection between two different sized duct openings.
  • Raised lips on the smaller opening for extra grip on ducting or your equipment's duct opening.
  • Galvanized steel body that is corrosion-resistant and can withstand high temperatures.
  • Adapts 6 inches to 4 inches | Product Length: 5 inches | Finish: Zinc Coating
$21.99
Was $25.99Save $4.00

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Product details

Size6" to 4"
MaterialGalvanized Steel
BrandAC Infinity
ColorBlack
Connector TypeReducer
Exterior FinishZinc
Item Weight0.34 Kilograms
Number of Pieces1
ManufacturerAC Infinity
UPC819137021334

Technical specifications

size6" to 4"
materialGalvanized Steel
brandAC Infinity
colorBlack
connector_typeReducer
exterior_finishZinc
item_weight12 ounces
number_of_pieces1
manufacturerAC Infinity
upc819137021334
part_numberAC-SDR64
package_dimensions6.81 x 6.69 x 6.61 inches
item_model_numberAC-SDR64
item_package_quantity1
batteries_includedNo
batteries_requiredNo
best_sellers_rank#38,182 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in HVAC Ducting
date_first_availableJanuary 21, 2020

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Customer reviews

4.51,265 ratings
★★★★★

Bought for my GF...

KaitlinAugust 1, 2022✓ Verified purchase

Got this for my GF... Glowforge, not girlfriend. While it's not an exact tight fit with the tubing for the external fan (also bought separate) If you throw some tape on there it works great. And MUCH cheaper than those that are made specifically for the external fan. Read more

★★★★★

Perfect fit for bathroom fan.

AVjeeperFebruary 24, 2026✓ Verified purchase

Perfect fit for bathroom fan. Slides right in. 6" to 4" Adapter. Read more

Review image 1Review image 2
★★★★★

Works great!

MattMay 16, 2021✓ Verified purchase

I was concerned about the fit of this product onto the AC Infinity 6” but what I received fit perfectly on my Infinity as well as onto the filter I connected it to. I think there might be a couple of versions of this product out there. The image that Amazon displays and many of the images in the reviews are of a product that is silver colored with crimped seams. What I received is black with welded seams. Very heavy duty, and again a perfect, easy fit. I’ll try to remember to add a photo later. Read more

★★★★☆

Fits Cloudline S6, but poor quality control!

ArjunMarch 17, 2022✓ Verified purchase

I bought four of these, and they fit differently! Three of them loosely slide over the cloud line S6 6” opening, and tone of them one does not fit at all because the opening is too tight. So, it seems that there is a quality control issue with this product. All products I received look identical in color, labeling, and packaging, but the opening diameter (so far only tested the 6" end) are different! So if the one you purchased doesn't fit because it's too tight, consider returning it and re-ordering another and you might have better luck. I demonstrate this by showing both of my duct adapters in a single picture, and you can see that one of them slides completely over the other, and yet their product labels are identical! If the manufacturer replies with an update that they have improved their quality control, I'll update my review. For the version that does slide over, it is not snug. So, I’ll have to secure it with duct tape or perhaps a glue gun or silicone glue. Was hoping it would be a snug fit, but I suppose having it a bit loose gives me more flexibility on how to secure it. It was fairly easing pushing 4” aluminum duct hose from TerraBloom (also available on amazon) over the 4” side and then using a 4” duct hose clamp to tighten the hose onto the 4” side. Read more

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★★★★★

Works well.

Jim C.July 20, 2025✓ Verified purchase

Great for adjusting flexible hosing to a large air handler unit. Read more

★★★★★

Correct measurements, solid metal.

Brian LeBaronJuly 7, 2024✓ Verified purchase

Bought two of these at different times. The product is definitely metal of a reasonable thickness. It is not plastic and it is not too thin. The measurements are correct. Quality product. Read more

★★★☆☆

Cheap but does the job

RiceJuly 7, 2024✓ Verified purchase

Made of medium weight cheap plastic, but appears to do the job. It says 4" to 6" - the 6" is perfect, but at least on my 4" pipe it is too small. A bit of duct tape works as a solution. But not sure what measurement system they're using. Read more

★★★★★

Straight, not crooked.

MaxMarch 27, 2020✓ Verified purchase

Well, like everything else from Infinity, this reducer is about as good as it gets. While it might seem like it would be hard to get something like this wrong, others seem to find a way to do it. These things are joined together in sections and others I have tried are all wonky and one end is sort of at an angle to the other end. These were straight and the metal is a decently heavy gauge. I will admit I was hoping they would be that sinister black Infinity color, but that's just me being a bit silly. Read more

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