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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🔄 Upgrade your airflow game with the ultimate duct adapter!

BUILT TO LAST - Durable galvanized steel with zinc coating resists corrosion and heat
GRIP ENHANCED DESIGN - Raised lips ensure a secure, slip-free connection every time
SEAMLESS SIZE TRANSITION - Effortlessly adapts 6" ducts to 4" openings without airflow loss
OPTIMIZE AIRFLOW EFFICIENCY - Maintains your system’s CFM for peak ventilation performance
VERSATILE VENTILATION SOLUTION - Perfect for grow tents, bathrooms, kitchens, and dust collectors

The AC Infinity Duct Adapter efficiently connects 6-inch to 4-inch duct openings with a durable galvanized steel body and zinc coating for corrosion and heat resistance. Its raised lip design ensures a secure fit, making it ideal for ventilation systems in grow tents, bathrooms, kitchens, and dust collection setups, all while maintaining optimal airflow efficiency.

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Manufacturer	AC Infinity
Part number	AC-SDR64
Item Weight	340 g
Package Dimensions	17.3 x 16.99 x 16.79 cm; 340 g
Item model number	AC-SDR64
Size	6 Zoll bis 4 Zoll
Color	Black
Material	Zinc-coated Metal
Number Of Pieces	1
Batteries Included?	No
Batteries Required?	No

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

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