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

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

🔇28 dBA ultra-quiet

⚙️10-speed EC motor control

🌬️205 CFM airflow

RM880

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Description

🌿 Elevate your air game—quiet, smart, and unstoppable ventilation.

WHISPER QUIET POWER - Experience powerful airflow at just 28 dBA—your secret weapon for stealthy ventilation.
ENERGY SMART EC MOTOR - PWM-controlled EC motor delivers max efficiency with minimal heat and noise—eco-friendly and wallet-friendly.
PRECISION AIRFLOW CONTROL - 10-speed wired controller plus app compatibility lets you tailor ventilation like a pro.
VERSATILE MOUNTING OPTIONS - Horizontal or vertical installation adapts seamlessly to your grow tent, AV rack, or room setup.
HIGH RESISTANCE AIRFLOW MASTERY - Mixed flow design with stator blades conquers tough airflow challenges in dense environments.

The AC Infinity CLOUDLINE PRO S4 is a premium 4-inch inline duct fan engineered for professional-grade ventilation. Featuring a powerful 205 CFM airflow, whisper-quiet 28 dBA noise level, and a programmable 10-speed EC motor controller compatible with app and remote controls, it excels in grow tents, hydroponics, AV cooling, and HVAC boosting. Its mixed flow blade design ensures efficient air delivery even in high-resistance ducting, while versatile mounting options and energy-efficient operation make it the top choice for millennial pros seeking smart, silent, and sustainable climate control.

Specifications

ASIN	B07JB292JC
Air Flow Capacity	205 cfm
Best Sellers Rank	#1,430 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 (4,242)
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)
Item Dimensions D x W x H	6.9"D x 11.9"W x 7.4"H
Item Weight	2.61 kg
Material	Polycarbonate
Model Name	CLOUDLINE S4
Model Number	CTR62A
Motor Type	EC motor
Mounting Type	Downrod Mount
Noise Level	28 db
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
Special Features	Programmable
Speed	2800 rpm
Standby Power Shutoff	High
Style	Cloudline S4
UPC	819137020290
Unit Count	1 Count
Voltage	240 volts_of_alternating_current
Wattage	21 watts

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