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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💨 Elevate your air game—quiet, powerful, and built for pros.

ENERGY SMART EC MOTOR - Save on energy bills with a mixed flow EC motor designed for efficiency without compromise.
POWERFUL 205 CFM AIRFLOW - Maximize ventilation with high-velocity air movement that keeps your environment fresh and optimized.
COMPLETE INSTALLATION KIT - Get started instantly with included power adapter, mounting hardware, and easy-to-follow manual.
WHISPER QUIET PERFORMANCE - Experience near-silent airflow at just 28 dBA—perfect for focused work or stealthy grow rooms.
PRECISION 8 SPEED CONTROLLER - Tailor your airflow with an intuitive PWM speed controller for ultimate environmental control.

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan delivering 205 CFM airflow at an ultra-quiet 28 dBA noise level. Featuring an energy-efficient EC motor with an 8-speed PWM controller, it’s designed for versatile ventilation needs including grow tents, HVAC boosting, and AV cooling. The kit includes all necessary hardware and a UK-compatible power plug, making it a plug-and-play solution for professional-grade air circulation.

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Brand	AC Infinity
Model Number	AI-CLS4
Colour	Blackone
Product Dimensions	9 x 19 x 30 cm; 2.58 kg
Power / Wattage	21 watts
Voltage	240 Volts
Noise Level	28 dB
Special Features	High Velocity, Waterproof
Item Weight	2.58 kg

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

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