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AC Infinity

AC Infinity Duct Reducer Adapter 8" to 6", Galvanized Steel HVAC Connector

  • Based on 1,296 reviews
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Availability: In Stock.
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Arrives Friday, Oct 2
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Size: 8" to 6"


Features

  • 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 8 inches to 6 inches | Product Length: 8.38 inches | Finish: Zinc Coating

Description

A ducting cone designed for adapting ductwork to equipment like bathroom fans and dust collectors. Maintains airflow efficiency by creating a seamless 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 8 inches to 6 inches | Product Length: 8.38 inches | Finish: Zinc Coating A ventilation ducting tool designed to fit different-sized duct hole openings together, connecting smaller ducting to bigger fans and vice versa. Using this duct adapter to connect your ventilation fans to your ducting will help retain your system’s CFM efficiency. It features a raised lip on the reducer end to provide extra grip on ducting or duct openings, while the increaser end features a flat brim to achieve a flush fit. The galvanized steel body is finished with a zinc coating that aids in its resistance to corrosion and high temperatures. Applications The duct adapter is a versatile tool that can be retrofitted with a variety of different-sized ducting and fans. It is commonly paired with bathroom exhaust fans and dust collection units to adapt them to smaller ductwork as a reducer. Other adaptation projects include range hoods, tumble dryers, grow tent ventilation systems, and connecting smaller ducts to bigger ducts. Product Identification Manufacturer AC Infinity Inc. Product Name Duct Reducer 8" to 6" Adapter Product Model AC-SDR86 UPC Code Product and Mounting Dimensions Duct Opening Sizes 8" to 6" Product Length . in. (. cm) Product Performance and Technical Specs Construction Galvanized Steel Color Metallic Silver Finish Zinc Coating

Size: 8" to 6"


Material: Galvanized Steel


Brand: AC Infinity


Color: Metallic Silver


Connector Type: Adapter


Item Weight: 0.68 kg


Number of Pieces: 1


Manufacturer: AC Infinity


Item Highlight: Galvanized Steel Reducer Increaser for Inline Fans, Bathroom Exhaust, Range Hoods, Dust Collectors, Grow Tents & Ductwork See more


Unit Count: 1 Count


Brand Name: AC Infinity


Number of Pieces: 1


Model Number: AC-SDR86


Manufacturer: AC Infinity


Unit Count: 1 Count


UPC: 819137021341


Manufacturer Part Number: AC-SDR86


Size: 8" to 6"


Item Weight: 0.68 kg


Connector Type: Adapter


Material Type: Galvanized Steel


Item Highlight: Galvanized Steel Reducer Increaser for Inline Fans, Bathroom Exhaust, Range Hoods, Dust Collectors, Grow Tents & Ductwork


Color: Metallic Silver


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Bought for my GF...
Size: 6" to 4"
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.
Reviewed in the United States on August 1, 2022 by Kaitlin
    • Perfect fit for bathroom fan.
Size: 6" to 4"
Review Image by AVjeeper
Review Image by AVjeeper
Perfect fit for bathroom fan. Slides right in. 6" to 4" Adapter.
Reviewed in the United States on February 24, 2026 by AVjeeper
    • Works great
Size: 6" to 4"
I recently bought a 14000 btu portland AC and the exhaust hose was too large for the vent hood built into my wall. This reducer was the perfect answer to my issue.
Reviewed in the United States on July 8, 2026 by Alycia M. Hayes
    • Fits Cloudline S6, but poor quality control!
Size: 6" to 4"
Review Image by Arjun
Review Image by Arjun
Review Image by Arjun
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. ... show more
Reviewed in the United States on March 17, 2022 by Arjun
    • Very high quality
Size: 8" to 6"
This is surprisingly good quality. It doesn’t get any better. I was very pleased!
Reviewed in the United States on June 15, 2026 by Northman
    • Works as intended
Size: 8" to 6"
This adapter worked great, exactly as advertised.
Reviewed in the United States on July 22, 2026 by Wayne
    • Works great!
Size: 6" to 4"
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. ... show more
Reviewed in the United States on May 16, 2021 by Matt
    • Works well.
Size: 8" to 6"
Great for adjusting flexible hosing to a large air handler unit.
Reviewed in the United States on July 20, 2025 by Jim C.

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