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

AC Infinity 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 corrosion resistance

🛡️Galvanized steel with zinc coating

MOP$372

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Description

🔧 Upgrade your airflow game — connect with confidence!

PRECISION FIT DESIGN - Raised lips and flat brim ensure a secure, slip-free connection every time.
COMPACT LIGHTWEIGHT - At just over 5 inches and 0.34 kg, it’s easy to install without bulk or hassle.
VERSATILE APPLICATION - Perfect for grow tents, bathroom fans, kitchen vents, and dust collectors—adapt your system effortlessly.
SEAMLESS AIRFLOW CONNECTION - Maintain peak ventilation efficiency by bridging different duct sizes without airflow loss.
RUGGED GALVANIZED STEEL BUILD - Durable zinc-coated steel resists corrosion and stands up to high temperatures for long-lasting performance.

The AC Infinity Duct Adapter efficiently connects 6-inch to 4-inch ducting, crafted from corrosion-resistant galvanized steel with a zinc finish. Designed for professional-grade ventilation systems including grow tents, bathrooms, and kitchens, it ensures optimal airflow retention with a secure, slip-resistant fit. Lightweight and compact, this adapter is a must-have for anyone serious about maintaining high-performance ductwork.

Specifications

ASIN	B0842XMBYC
Best Sellers Rank	#41,704 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #55 in HVAC Ducting
Brand Name	AC Infinity
Color	Black
Connector Type	Reducer
Customer Reviews	4.5 4.5 out of 5 stars (1,296)
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 Packs	1
Number of Pieces	1
Size	6" to 4"
UPC	819137021334
Unit Count	1 Count

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MOP$372

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