Won't this hurt cfm's?

I used this for my smoker shed, so not sure about the cfm's

How does this effect the rated CFM?

CFM is a measure of volume over time. Any time the output is restricted (say 6" down to 4") you can expect a back pressure and a REDUCTION in CFM, even if there is an increase in velocity (speed) of the airflow. Opening back up this restriction (4" up to 6") will not necessarily increase your CFM, it just decreases the velocity of the airflow and is less restrictive. It is not possible to increase CFM in this manner, without the introduction of another fan beyond the initial restriction.

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Duct Reducer Adapter 6" to 4", Galvanized Steel HVAC Connector | Galvanized Steel Reducer Increaser for Inline Fans, Bathroom Exhaust, Range Hoods, Dust Collectors, Grow Tents & Ductwork

Product ID: 668052263

Details

Size
6" to 4"
Material
Galvanized
Brand
AC Infinity
Colour
Black
Connector Type
Reducer
Thread Size
6" to 4"

📏6" to 4" duct size adapter

🔥High-temp zinc coating finish

🛡️Galvanized steel corrosion-resistant body

$U5613

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Description

🔧 Upgrade your airflow game with precision and durability!

PRECISION FIT DESIGN - Raised lips and flat brim ensure secure grip and flush fit for hassle-free installation.
COMPACT LIGHTWEIGHT - Just 5.11 inches long and 0.34 kg for easy integration into any duct setup.
VERSATILE APPLICATION - Perfect for grow tents, bathroom fans, dust collectors, and kitchen ventilation systems.
SEAMLESS AIRFLOW CONNECTION - Maintain peak ventilation efficiency by bridging different duct sizes without airflow loss.
RUGGED GALVANIZED STEEL BUILD - Durable, corrosion-resistant construction built to last in demanding environments.

The AC Infinity Duct Adapter efficiently connects 6-inch to 4-inch duct openings with a corrosion-resistant galvanized steel body and zinc coating. Designed for seamless airflow retention, it features raised lips for secure duct grip and a compact 5.11-inch length, making it ideal for grow tents, bathroom fans, and kitchen ventilation systems.

Specifications

ASIN	B0842XMBYC
Brand	AC Infinity
Brand Name	AC Infinity
Colour	Black
Connector Type	Reducer
Country of Publication	USA
Customer Reviews	4.4 out of 5 stars 910 Reviews
Exterior Finish	Zinc
Item Weight	0.34 Kilograms
Manufacturer	AC Infinity
Manufacturer Part Number	AC-SDR64
Material	Galvanized Steel
Material Type	Galvanized Steel
Model Number	AC-SDR64
Number of Pieces	1
Size	6" to 4"
Thread Size	6" to 4"
UPC	819137021334
Unit Count	1 Count

Reviews

C**A

Ac Infinity !

Sehr gute Qualität und stabiles Material . Man hat sich was dabei gedacht weil der Adapter so aufgebaut ist das ein Schlauch in der Größe drüber geht . Also etwa 148 und 98 mm Material

2.04.2026

K**N

Bought for my GF...

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.

1.08.2022

B**N

Fits Perfect

Excellent fit, arrived fast, great quality

28.12.2025

P**O

Excellent product

Fits well, does the job it has to do. Sturdy metal.

6.03.2025

A**R

Perfect fit for bathroom fan.

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

24.02.2026

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$U5613

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

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