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 airflow game with silent power and smart efficiency!

ENERGY SMART DESIGN - Consumes just 24 watts with PWM-controlled EC motor, saving energy without sacrificing power.
VERSATILE COMPATIBILITY - Fits seamlessly with 4” ducts and is ideal for grow tents, AV racks, desktops, and laptops alike.
POWERFUL AIRFLOW CONTROL - Delivers a robust 205 CFM to keep your environment fresh and optimized, from AV racks to grow tents.
COMPLETE INSTALLATION KIT - Includes power adapter, mounting hardware, and manual—plug and play for instant airflow upgrade.
WHISPER QUIET PERFORMANCE - Operates at a barely-there 28 dBA, perfect for focused work or stealthy grow tent ventilation.

The AC Infinity CLOUDLINE S4 is a 4-inch inline duct fan engineered for quiet, energy-efficient ventilation. With a powerful 205 CFM airflow and ultra-low 28 dBA noise level, it’s perfect for grow tents, AV racks, and desktop cooling. Featuring an 8-speed PWM controller and dual ball bearings, it ensures customizable, long-lasting performance. The kit includes everything needed for quick installation, making it a must-have for professionals seeking reliable, discreet climate control.

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Brand	AC Infinity
Product Dimensions	9 x 19 x 30 cm; 2.61 kg
Item model number	CLOUDLINE S4
Manufacturer	AC Infinity
Series	CLOUDLINE S4
Color	Black
Voltage	240 Volts
Wattage	21 watts
Power Source	Power Adapter
Are Batteries Included	No
Item Weight	2.61 Kilograms

AC Infinity CLOUDLINE S4, 4” Inline Duct Fan, Quiet & Energy Efficient, 205 CFM, 28 dBA, 24W, 11.9” x 6.9” x 9cm, Compatible with Grow Tents, AV Racks, Desktops & Laptops

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