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 Reducer Adapter 6" to 4", Galvanized Steel HVAC Connector

AC Infinity Duct Reducer Adapter 6" to 4", Galvanized Steel HVAC Connector

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

NZ$89

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Description

🔧 Upgrade your airflow game with the ultimate duct adapter — because efficiency never goes out of style!

PRECISION FIT DESIGN - Raised lips on the smaller end ensure a secure grip, preventing slippage and leaks.
COMPACT EASY INSTALLATION - At just over 5 inches long, it fits tight spaces and installs effortlessly for instant upgrades.
SEAMLESS AIRFLOW CONNECTION - Maintain peak ventilation efficiency by bridging different duct sizes without airflow loss.
VERSATILE HVAC COMPATIBILITY - Perfect for bathroom fans, dust collectors, grow tents, and kitchen ventilation systems.
RUGGED GALVANIZED STEEL BUILD - Durable zinc-coated steel resists corrosion and withstands high temperatures for long-lasting performance.

The AC Infinity Duct Adapter is a premium 6" to 4" galvanized steel reducer designed to optimize airflow connections in HVAC systems. Featuring a corrosion-resistant zinc coating and raised lips for secure duct grip, it ensures durable, high-temperature performance across bathroom fans, dust collectors, grow tents, and more. Compact and easy to install, it’s the smart choice for professionals seeking reliable ventilation upgrades.

Specifications

ASIN	B0842XMBYC
Best Sellers Rank	#37,136 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #52 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 Highlight	Galvanized Steel Reducer Increaser for Inline Fans, Bathroom Exhaust, Range Hoods, Dust Collectors, Grow Tents & Ductwork
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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NZ$89

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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