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 with Speed Controller – EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

Product ID: 89275796

Details

Brand
AC Infinity
Color
Pro Speed for
Electric fan design
Exhaust Fan
Mounting Type
Downrod Mount
Power Source
AC
Product Dimensions
6.9"D x 11.9"W

💨205 CFM airflow

🔇28 dBA ultra-quiet

⚙️10-speed EC motor control

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€ 244.21

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Description

💨 Elevate your air game with silent, smart airflow mastery!

BUILT TO LAST - Durable dual ball bearings and premium polycarbonate housing ensure long-term reliability.
WHISPER QUIET POWER - Ultra-low 28 dBA noise keeps your space peaceful and productive.
ENERGY SMART EC MOTOR - PWM-controlled motor delivers max airflow with minimal energy use.
VERSATILE INSTALLATION - Compact 4” duct size fits grow tents, AV racks, and home HVAC boosters.
PRECISION AIRFLOW CONTROL - 10-speed wired controller plus app compatibility for tailored ventilation.

The CLOUDLINE PRO S4 is a premium 4-inch inline duct fan featuring a powerful 205 CFM airflow and whisper-quiet 28 dBA noise level. Equipped with a PWM-controlled EC motor and a 10-speed wired controller compatible with smart UIS systems, it offers precise, energy-efficient ventilation ideal for grow tents, hydroponics, AV racks, and HVAC boosting. Its robust build with dual ball bearings and mixed flow blade design ensures reliable, long-lasting performance in high-resistance duct setups.

Specifications

ASIN	B07JB292JC
Air Flow Capacity	205 Cubic Feet Per Minute
Best Sellers Rank	#1,989 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Hydroponic Ventilation Equipment
Blade Length	7.4 Inches
Blade Material	Plastic
Brand Name	AC Infinity
Cable Length	144 Inches
Collection Name	Channel Fans
Color	Pro Speed Controller for S4
Control Method	App
Controller Type	Button Control,Remote Control,App Control
Customer Reviews	4.7 4.7 out of 5 stars (4,227)
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	6.9"D x 11.9"W x 7.4"H
Item Weight	2.61 Kilograms
Material	Polycarbonate
Model Name	CLOUDLINE S4
Model Number	AI-CLS4
Motor Type	EC motor
Mounting Type	Downrod Mount
Noise Level	28 Decibels
Number of Blades	10
Number of Power Levels	10
Number of Speeds	8
Part Number	AI-CLS4
Power Source	AC
Recommended Uses For Product	Inline Duct Fan
Room Type	Indoor
Size	4-Inch
Smart Home Compatibility	Smart Home Compatible
Special Features	Programmable
Speed	2800 RPM
Standby Power Shutoff	High
Style	Cloudline S4
UPC	819137020290
Unit Count	1.0 Count
Voltage	240 Volts (AC)
Wattage	21 watts

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