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

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

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" precision fit

🔥High-temp zinc coating durability

🛡️Galvanized steel corrosion-resistant

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$115.65

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Description

🔧 Upgrade your airflow game with precision and durability!

BUILT TO LAST - Galvanized steel body with zinc finish resists corrosion and heat for long-term reliability.
GRIP ENHANCED DESIGN - Raised lips on smaller end ensure a secure, slip-free connection every time.
SEAMLESS SIZE TRANSITION - Effortlessly adapts 6" ducts to 4" for perfect airflow integration.
MAXIMIZED AIRFLOW EFFICIENCY - Maintains optimal CFM by creating a smooth, leak-free duct connection.
VERSATILE VENTILATION SOLUTION - Ideal for grow tents, bathroom fans, dust collectors, and kitchen vents alike.

The AC Infinity Duct Adapter is a robust 6" to 4" galvanized steel reducer designed to connect different sized duct openings seamlessly. Featuring a zinc-coated finish for corrosion and heat resistance, it ensures secure grip and maintains airflow efficiency across ventilation systems including grow tents, bathrooms, and dust collectors.

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 909 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

2.04.2026

K**N

1.08.2022

B**N

28.12.2025

P**O

6.03.2025

A**R

24.02.2026

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