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.

Ac Infinity Duct Adapter 6 To 4 Ducting Reducer Increaser

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

₨38893

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Sri Lanka.

Secure transaction

Description

🔧 Upgrade your airflow game with precision and durability!

ENHANCED GRIP DESIGN - Raised lips ensure a secure, slip-free connection with your ducting or equipment.
SEAMLESS SIZE TRANSITION - Effortlessly adapts 6" ducts to 4" for perfect airflow integration.
DURABLE ZINC COATED STEEL - Built to resist corrosion and withstand high temperatures for long-lasting performance.
OPTIMIZED AIRFLOW EFFICIENCY - Maintains your system’s CFM by preventing leaks and pressure drops.
VERSATILE VENTILATION SOLUTION - Ideal for grow tents, bathroom fans, dust collectors, and kitchen vents.

The AC Infinity Duct Adapter is a robust 6" to 4" galvanized steel reducer designed to connect different sized duct openings seamlessly. Featuring a zinc coating for corrosion and heat resistance, it ensures secure airflow with raised lips for extra grip. Perfect for enhancing ventilation efficiency in grow tents, bathrooms, kitchens, and dust collection systems.

Specifications

ASIN	B0842XMBYC
Best Sellers Rank	#54,823 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #81 in Heating & Cooling Ducting Products
Brand	AC Infinity
Brand Name	AC Infinity
Color	Black
Colour	Black
Connector Type	Adapter
Connector type	Adapter
Customer Reviews	4.5 out of 5 stars 1,205 Reviews
Exterior Finish	Zinc
Item Weight	0.34 Kilograms
Manufacturer	AC Infinity
Manufacturer Part Number	AC-SDR64
Material	Zinc-coated Metal
Material Type	Zinc-coated Metal
Model Number	AC-SDR64
Number of Packs	1
Number of Pieces	1
Size	6" to 4"
Thread Size	6" to 4"
Thread Type	Metric Tapered
Thread size	6" to 4"
UPC	819137021334
Unit Count	1 Count

Reviews

M**G

Rohradapter 200mm auf 150 mm

Zwar etwas Hochpreisig , aber stabile Verarbeitung u passt korrekt an/in die Rohre für einen dichten Übergang.

20.03.2026

C**A

Ac Infinity !

Sehr gute Qualität und stabiles Material . Man hat sich was dabei gedacht weil der Adapter so aufgebaut ist das ein Schlauch in der Größe drüber geht . Also etwa 148 und 98 mm Material

2.04.2026

K**N

Bought for my GF...

Got this for my GF... Glowforge, not girlfriend. While it's not an exact tight fit with the tubing for the external fan (also bought separate) If you throw some tape on there it works great. And MUCH cheaper than those that are made specifically for the external fan.

1.08.2022

T**T

Works great

Works as it should

29.12.2023

B**N

Fits Perfect

Excellent fit, arrived fast, great quality

28.12.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Pooja R.

The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.