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.

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

Product ID: 370867944

Details

Brand
AC Infinity
Colour
Black
Connector type
Adapter
Material
Zinc-coated
Size
6" to 4"

📏6" to 4" duct size adapter

🔥High temperature resistant zinc coating

🛡️Galvanized steel corrosion-resistant body

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€ 76.08

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Description

🔧 Upgrade your airflow game — connect, secure, and conquer ventilation like a pro!

SECURE GRIP DESIGN - Raised lips on the smaller end ensure a tight, slip-free fit with your ducting or equipment.
COMPACT EASY TO INSTALL - At just over 5 inches long, it fits snugly without bulky interference in your duct system.
SEAMLESS AIRFLOW CONNECTION - Effortlessly bridges 6" and 4" ducts to maintain optimal ventilation efficiency.
DURABLE GALVANIZED STEEL BUILD - Engineered to resist corrosion and withstand high heat for long-lasting performance.
VERSATILE VENTILATION SOLUTION - Perfect for grow tents, bathroom fans, dust collectors, and kitchen range hoods.

The AC Infinity Duct Adapter efficiently adapts 6-inch to 4-inch duct openings with a corrosion-resistant galvanized steel body and zinc coating. Designed for professional-grade ventilation systems including grow tents, bathroom fans, and dust collectors, it ensures a secure fit with raised lips and maintains airflow efficiency while resisting high temperatures.

Specifications

ASIN	B0842XMBYC
ASIN	B0842XMBYC
Best Sellers Rank	#53,718 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in Heating & Cooling Ducting Products
Brand Name	AC Infinity
Color	Black
Connector Type	Adapter
Customer Reviews	4.5 4.5 out of 5 stars (1,177)
Customer reviews	4.5 4.5 out of 5 stars (1,177)
Date First Available	1 March 2020
Exterior Finish	Zinc
Item Weight	0.34 Kilograms
Item model number	AC-SDR64
Manufacturer	AC Infinity
Manufacturer	AC Infinity
Material Type	Zinc-coated Metal
Model Number	AC-SDR64
Number of Pieces	1
Package Dimensions	17.3 x 16.99 x 16.79 cm; 340 g
Size	6" to 4"
Thread Size	6" to 4"
Thread Type	Metric Tapered
UPC	819137021334
Unit Count	1 Count

Reviews

M**G

Zwar etwas Hochpreisig , aber stabile Verarbeitung u passt korrekt an/in die Rohre für einen dichten Übergang.

20.03.2026

K**N

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

T**T

Works as it should

29.12.2023

B**N

Excellent fit, arrived fast, great quality

28.12.2025

P**O

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

6.03.2025

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€ 76.08

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

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TrustScore 4.5 | 7,300+ reviews

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