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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CLOUDLINE S4, Quiet 100mm Inline Duct Fan | with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch

Product ID: 228868320

Details

Brand
AC Infinity
Colour
Pro Speed for
Electric fan design
Exhaust Fan
Mounting type
Wall Mount
Power source
Power Adapter
Product dimensions
17.5D x 18.8W

💨205 CFM airflow

🔇28 dBA ultra-quiet

⚙️8-speed PWM control

Description

💨 Elevate your air game—quiet, powerful, and in total control.

WHISPER QUIET POWER - Experience powerful airflow at just 28 dBA—perfect for focused work or relaxation without distraction.
ENERGY SMART EFFICIENCY - Brushless EC motor delivers high velocity airflow with minimal energy consumption—eco-friendly and cost-effective.
PRO GRADE BUILD QUALITY - Durable polypropylene blades and powder-coated finish ensure long-lasting performance in any indoor setting.
PRECISION AIRFLOW CONTROL - 8-speed manual PWM controller lets you tailor ventilation exactly to your environment’s needs.
VERSATILE MOUNTING OPTIONS - Wall or ceiling mount ready with all hardware included, seamlessly integrating into your space.

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan engineered for superior ventilation with 205 CFM airflow and whisper-quiet 28 dBA noise levels. Featuring an 8-speed PWM-controlled brushless motor, it offers precise airflow management while maintaining energy efficiency. Designed for versatile indoor use including grow tents, AV racks, and studios, it comes complete with mounting hardware and a power adapter compatible with UK voltage standards.

Specifications

ASIN	B07JB292JC
Air Flow Capacity	205 Cubic Feet Per Minute
Best Sellers Rank	9,310 in Garden ( See Top 100 in Garden ) 2 in Hydroponic Ventilation Equipment
Blade Length	7.4 Inches
Blade Material	Plastic
Brand Name	AC Infinity
Collection Name	Channel Fans
Colour	Pro Speed Controller for S4
Control Method	Push Button
Controller Type	manual
Customer Reviews	4.7 4.7 out of 5 stars (4,047)
Electric Fan Design	Exhaust Fan
Finish Type	Powder Coated
Global Trade Identification Number	00819137020290
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	wall/ceiling mounted
Is Product Cordless	No
Item Dimensions D x W x H	17.5D x 18.8W x 30.2H centimetres
Item Weight	2.61 Kilograms
Manufacturer	AC Infinity
Material	Polypropylene
Model Name	CLOUDLINE S4
Model Number	CTR62A
Motor Type	Brushless
Mounting Type	Wall Mount/Ceiling Mount
Noise Level	28 Decibels
Number of Blades	10
Number of Packs	1
Number of Power Levels	8
Number of Speeds	8
Part Number	AI-CLS4
Power Source	Power Adapter
Recommended Uses For Product	Air Circulation, Cooling, Exhausting
Room Type	Kitchen
Size	4 inch
Special Features	High Velocity, Waterproof
Speed	2800 RPM
Standby Power Shutoff	Alta eficiência
Style	Industrial
UPC	819137020290
Unit Count	1.0 count
Voltage	240 Volts (AC)
Wattage	21 watts

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