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 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

💨212 CFM airflow

🔇27 dBA ultra-quiet

⚙️10-speed precision control

€ 270.88

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Quiet power for your green empire — breathe easy, grow smarter!

COMPACT YET POWERFUL - 4-inch duct size with 212 CFM airflow fits seamlessly into tight grow spaces while maximizing ventilation.
IP 65 RATED DURABILITY - Built to resist moisture, dust, and debris for reliable performance in humid environments.
PRECISION AIRFLOW MANAGEMENT - 10-level speed controller lets you dial in exact ventilation to prevent CO2 buildup.
WHISPER QUIET CLIMATE CONTROL - Maintain perfect grow tent conditions without the noise distractions.
ENERGY EFFICIENT BRUSHLESS MOTOR - PWM-controlled EC motor delivers powerful airflow with minimal power consumption.

The AC Infinity CLOUDLINE H4 is a 4-inch inline duct fan engineered for grow tents and mushroom cultivation. Featuring a brushless EC motor with PWM control, it delivers 212 CFM airflow at an ultra-quiet 27 dBA noise level. Its IP65 rating ensures durability in high-humidity environments, while the included 10-speed controller offers precise ventilation management to optimize indoor climate and prevent CO2 buildup.

Specifications

ASIN	B0DHYP3ZQY
Air Flow Capacity	212 cfm
Best Sellers Rank	#1,861 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Hydroponic Ventilation Equipment
Brand	AC Infinity
Brand Name	AC Infinity
Collection Name	Specialty Fans
Color	IP65 Speed Controller for H4
Control Method	Touch
Customer Reviews	4.5 out of 5 stars 66 Reviews
Electric Fan Design	Blower
Electric fan design	Blower
Finish Type	Powder Coated
Included Components	Cord
Indoor Outdoor Usage	Indoor
Installation Type	Permanent Installation
Item Dimensions D x W x H	6.9"D x 11.9"W x 7.4"H
Item Weight	2.09 kg
Manufacturer	AC Infinity
Material	Plastic
Model Name	CLOUDLINE H4
Model Number	AI-CLH4
Motor Type	Brushless
Mounting Type	Downrod Mount
Noise Level	27 db
Number of Power Levels	10
Number of Speeds	10
Part Number	AI-CLH4
Power Source	AC
Product Dimensions	6.9"D x 11.9"W x 7.4"H
Recommended Uses For Product	Inline Duct Fan
Room Type	Indoor
Size	4-Inch
Special Features	Programmable
Speed	3000 rpm
Style	Cloudline H4
UPC	819137024595
Unit Count	1 Count
Voltage	100 volts
Wattage	18 watts

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