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, 150mm to 100mm Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems, 6" to 4"

AC Infinity Duct Adapter, 150mm to 100mm Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems, 6" to 4"

Product ID: 506793367

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Details

Size
6 Zoll bis 4
Material
Galvanized
Brand
AC Infinity
Colour
Black
Connector type
Adapter
Exterior finish
Zinc

📏6" to 4" duct size adapter

🔥High-temp zinc coating finish

🛡️Galvanized steel corrosion-resistant body

Description

🔗 Connect with confidence — upgrade your airflow game!

RUGGED DURABILITY - Galvanized steel construction with zinc coating ensures long-lasting corrosion and heat resistance.
SECURE FIT DESIGN - Raised lips on smaller end provide extra grip, preventing duct slippage and leaks.
COMPACT LIGHTWEIGHT - Just 5.11 inches long and 340g, easy to install without bulky hardware.
VERSATILE COMPATIBILITY - 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.

The AC Infinity Duct Adapter efficiently adapts 6-inch ducting to 4-inch openings, crafted from galvanized steel with a zinc coating for corrosion and heat resistance. Designed with raised lips for a secure grip, it ensures seamless airflow in ventilation systems like grow tents, bathroom fans, and dust collectors, all in a compact 5.11-inch length.

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Manufacturer	AC Infinity
Part Number	AC-SDR64
Package Dimensions	17.3 x 16.99 x 16.79 cm; 340 g
Item model number	AC-SDR64
Size	6 Zoll bis 4 Zoll
Colour	Black
Material	Galvanized Steel
Number of Pieces	1
Batteries included?	No
Batteries Required?	No
Item Weight	340 g

AC Infinity Duct Adapter, 150mm to 100mm Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems, 6" to 4"

Details

Description

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