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...

ASIN	B07JB292JC
Air Flow Capacity	205 Cubic Feet Per Minute
Best Sellers Rank	#37,165 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #60 in Household Ventilation Fans
Blade Length	7.4 Inches
Blade Material	Plastic
Brand	AC Infinity
Brand Name	AC Infinity
Color	blackone
Colour	blackone
Control Method	Push Button
Controller Type	Button Control
Customer Reviews	4.7 out of 5 stars 9,777 Reviews
Electric Fan Design	Exhaust Fan
Electric fan design	Exhaust Fan
Finish Type	Powder Coated
Global Trade Identification Number	00819137020290
Included Components	Cord
Indoor Outdoor Usage	Indoor
Is Product Cordless	No
Item Dimensions D x W x H	17.6D x 30.3W x 18.8H centimeters
Item Weight	2.61 Kilograms
Manufacturer	AC Infinity
Material	Tin, Pe
Model Name	CLOUDLINE S4
Model Number	CLOUDLINE S4
Mounting Type	Wall Mount/Ceiling Mount
Noise Level	28 Decibels
Number of Blades	10
Number of Power Levels	10
Number of Speeds	8
Power Source	Power Adapter
Power source	Power Adapter
Product dimensions	17.6D x 30.3W x 18.8H centimeters
Recommended Uses For Product	Cooling
Room Type	Kitchen
Special Features	High Velocity, Waterproof
Speed	2800 RPM
Standby Power Shutoff	Alta eficiência
Style	Industrial
UPC	819137020290
Unit Count	1 Count
Voltage	240 Volts
Wattage	21 watts

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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