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 Adapter, 150mm to 100mm 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 zinc coating finish

🛡️Galvanized steel corrosion-resistant body

R964

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Upgrade your airflow game with the ultimate duct adapter!

RUGGED DURABILITY - Galvanized steel with zinc finish resists corrosion and high heat for long-lasting performance.
SECURE GRIP DESIGN - Raised lips ensure your ducting stays firmly in place—no slips, no leaks.
COMPACT EFFICIENT - At just over 5 inches long, it fits tight spaces without compromising airflow.
VERSATILE COMPATIBILITY - Perfect for grow tents, bathroom fans, kitchen vents, and dust collectors alike.
SEAMLESS AIRFLOW CONNECTION - Maintain peak ventilation efficiency by bridging different duct sizes flawlessly.

The AC Infinity Duct Adapter efficiently connects 6-inch to 4-inch ducting, crafted from corrosion-resistant galvanized steel with a zinc coating to withstand high temperatures. Designed for professional-grade ventilation systems including grow tents, bathrooms, kitchens, and dust collectors, it ensures secure, leak-free airflow with its raised lip grip and compact 5.11-inch length.

Specifications

ASIN	B0842XMBYC
Best Sellers Rank	#37,198 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 (1,293)
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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