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 | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems

AC Infinity Duct Adapter, 6” to 4” Ducting Reducer Increaser Cone | Designed for Grow Tents, Bathroom, Kitchen, or Ventilation Systems

Product ID: 185719628

Details

Brand
AC Infinity
Color
Black
Connector Type
Reducer
Exterior Finish
Zinc
Item Weight
0.34 kg
Manufacturer
AC Infinity

📏6" to 4" duct size adapter

🔥High-temp corrosion resistance

🛡️Galvanized steel with zinc coating

€ 62.98

Duties & taxes included

In stock

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Description

🔧 Upgrade your airflow game — connect with confidence!

SECURE GRIP DESIGN - Raised lips ensure a tight, slip-free fit on smaller ducts
COMPACT EFFICIENT - Slim 5.11-inch length fits easily into tight HVAC setups
SEAMLESS AIRFLOW CONNECTION - Maintains optimal CFM efficiency between mismatched duct sizes
DURABLE GALVANIZED STEEL BUILD - Engineered to resist corrosion and withstand high temperatures
VERSATILE VENTILATION SOLUTION - Perfect for grow tents, bathroom fans, kitchen vents, and dust collectors

The AC Infinity Duct Adapter efficiently bridges 6-inch and 4-inch duct openings with a corrosion-resistant galvanized steel body finished in zinc. Designed for professional-grade ventilation systems, it ensures secure, slip-free connections while maintaining airflow efficiency in grow tents, bathrooms, kitchens, and dust collection setups.

Specifications

ASIN	B0842XMBYC
Best Sellers Rank	#32,831 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in HVAC Ducting
Brand Name	AC Infinity
Color	Black
Connector Type	Reducer
Customer Reviews	4.5 4.5 out of 5 stars (1,292)
Exterior Finish	Zinc
Item Weight	0.34 kg
Manufacturer	AC Infinity
Manufacturer Part Number	AC-SDR64
Material Type	Galvanized Steel
Model Number	AC-SDR64
Number of Pieces	1
Size	6" to 4"
UPC	819137021334
Unit Count	1 Count

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