What is the max temp of use for this fan? i see you said 240f, but all other manufacturers with plastic impellers say max temp 140f. are you certain?

Always stay a minimum of 25% below specified temp. At minimum they can warp and and motor performance would be affected

If powered from a switched outlet, will it remember the last speed setting or does that require constant power?

Morning RS, the S4 will not remember your fan speed. It’s a manual setting only. I also have a T4 with a smart controller and it does remember and can be set to auto for heat and humidity. The T4 is for auto exhaust and S4 is intake. If it is your only fan go with the T4. Also, if you have more than 200sf to ventilate go directly to the T6. The are very quiet which is important as my room is under a bedroom. Hope this helps.

How well does this work with a carbon filter?

I have a 350 Cfm Coco/Carbon Fiber filter that I place on the Exit side of my application. I have tested the filter on both the intake and the exit. I found these units Push much better than they Pull. I do have to increase the power by 10% when I install the exit filter, but it's not really an issue in my application.

What is the best way to connect this to 12 or 24 volt system?

AC infinity, also looking for DC system compatibility off grid use with solar and lithium battery banks. Want to avoid DC->AC->DC to save wattage. I like that your fan design is efficient, but not in my case as the conversion costs wattage/heat. Ended up buying Atwood unit which does 12/24v which is no where near as nice a fan as this...

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AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan

AC Infinity CLOUDLINE PRO S4, Quiet 4” Inline Duct Fan

Product ID: 551898487

Details

Brand
AC Infinity
Colour
Pro Speed for
Electric fan design
Exhaust Fan
Mounting Type
Downrod Mount
Power Source
AC
Product Dimensions
17.5D x 30.2W

💨205 CFM airflow

🔇28 dBA ultra-quiet

⚙️8-speed PWM EC motor

£321.47

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Description

💨 Quiet power, smart control — breathe easy, work smarter.

ENERGY SMART EC MOTOR - PWM-controlled EC motor maximizes energy savings while delivering powerful, consistent ventilation.
WHISPER QUIET OPERATION - At just 28 dBA, it keeps your space cool without the noise pollution—ideal for focused work or relaxation.
PRECISION AIRFLOW CONTROL - 8-speed PWM controller lets you dial in perfect airflow with whisper-quiet efficiency.
SEAMLESS SMART INTEGRATION - Compatible with AC Infinity UIS controllers for intelligent programming and remote app control—future-proof your airflow.
VERSATILE MOUNTING DURABILITY - Dual ball bearings rated for 67,000 hours and IP44 rating ensure long-lasting, flexible installation anywhere.

The AC Infinity CLOUDLINE PRO S4 is a premium 4-inch inline duct fan engineered for ultra-quiet, energy-efficient ventilation. Featuring a PWM-controlled EC motor with 8-speed settings, it delivers 205 CFM airflow at just 28 dBA noise. Its mixed flow design and dual ball bearings ensure high static pressure performance and durability, while IP44 rating protects against dust and moisture. Ideal for grow tents, AV racks, and indoor air circulation, it includes a wired speed controller and supports smart integration for precise environmental control.

Specifications

ASIN	B07JB292JC
Air Flow Capacity	205 Cubic Feet Per Minute
Best Sellers Rank	#121,327 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #112 in Ventilation Equipment
Blade Length	7.4 Inches
Blade Material	Plastic
Brand Name	AC Infinity
Cable Length	144 Inches
Collection Name	Channel Fans
Colour	Pro Speed Controller for S4
Control Method	App
Controller Type	Button Control,Remote Control,App Control
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (4,042)
Electric Fan Design	Exhaust Fan
Finish Type	Matte
Global Trade Identification Number	00819137020290
Included Components	Cord, Remote
Indoor Outdoor Usage	Indoor
Installation Type	Versatile Mounting (Horizontal or Vertical)
Is Product Cordless	No
Item Dimensions D x W x H	17.5D x 30.2W x 18.8H Centimeters
Item Weight	2.61 Kilograms
Manufacturer	AC Infinity
Material Type	Polypropylene
Model Name	CLOUDLINE S4
Model Number	CTR62A
Motor Type	EC motor
Mounting Type	Downrod Mount
Noise Level	28 Decibels
Number Of Speeds	8
Number of Blades	10
Number of Power Levels	10
Part Number	AI-CLS4
Power Source Type	AC
Recommended Uses For Product	Inline Duct Fan
Room Type	Indoor
Size	4-Inch
Special Features	Programmable
Speed	2800 RPM
Standby Power Shutoff	High
Style Name	Cloudline S4
Switch Type	Push Button
UPC	819137020290
Unit Count	1.0 Count
Voltage	240 Volts (AC)
Wattage	21 Watts

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