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

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: 551898487

Details

Brand
AC Infinity
Colour
Pro Speed
Electric fan design
Exhaust Fan
Mounting Type
Wall Mount
Power Source
Corded
Product Dimensions
17.5D x 18.8W

🔇28 dBA ultra-quiet

⚙️8-speed PWM EC motor

🌬️205 CFM airflow

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Description

🌬️ Quiet power that keeps your space fresh and your vibe professional.

ENERGY SMART EC MOTOR - PWM-controlled EC motor delivers high airflow with minimal energy use and heat generation.
PLUG PLAY CONVENIENCE - Complete kit with wired controller, mounting hardware, and compatibility with smart UIS controllers for seamless integration.
PRECISION AIRFLOW CONTROL - 8-speed PWM controller lets you dial in perfect ventilation with whisper-quiet efficiency.
WHISPER QUIET PERFORMANCE - At just 28 dBA, keep your environment calm and focused without sacrificing power.
DURABLE VERSATILE DESIGN - Dual ball bearings rated for 67,000 hours and IP44 rating ensure long-lasting, reliable operation in any orientation.

The AC Infinity CLOUDLINE PRO S4 is a 4-inch inline duct fan engineered for high-efficiency ventilation with 205 CFM airflow and ultra-quiet 28 dBA noise level. Featuring an 8-speed PWM-controlled EC motor, it offers precise speed control and energy-efficient operation. Its mixed flow design and dual ball bearings ensure reliable performance even in high static pressure environments. Ideal for grow tents, AV racks, and HVAC applications, it includes a wired speed controller and mounting hardware for easy installation and smart system compatibility.

Specifications

ASIN	B07JB292JC
Air Flow Capacity	205 Cubic Feet Per Minute
Best Sellers Rank	#133,418 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #69 in Ventilation Equipment
Blade Length	7.4 Inches
Blade Material	Plastic
Brand	AC Infinity
Brand Name	AC Infinity
Cable Length	144 Inches
Collection Name	Channel Fans
Colour	Pro Speed Controller
Control Method	App
Controller Type	Button Control,Remote Control,App Control
Customer Reviews	4.7 out of 5 stars 3,897 Reviews
Electric Fan Design	Exhaust Fan
Electric fan design	Exhaust Fan
Finish Type	Matte
Global Trade Identification Number	00819137020290
Included Components	Cord, Remote
Indoor Outdoor Usage	Indoor
Installation Type	Versatile Mounting (Horizontal or Vertical)
Is Product Cordless	No
Item Dimensions D x W x H	17.5D x 18.8W x 30.2H Centimeters
Manufacturer	AC Infinity
Material Type	Polycarbonate
Model Name	CLOUDLINE S4
Model Number	CLOUDLINE S4
Motor Type	EC motor
Mounting Type	Wall Mount/Ceiling Mount
Noise Level	28 Decibels
Number Of Speeds	8
Number of Blades	10
Number of Power Levels	10
Part Number	AI-CLS4
Power Source	Corded Electric
Power Source Type	Corded Electric
Product Dimensions	17.5D x 18.8W x 30.2H Centimeters
Recommended Uses For Product	Air Circulation, Cooling
Room Type	Kitchen
Size	4-Inch
Special Features	Bladeless
Speed	2800 RPM
Standby Power Shutoff	High
Style	Modern
Style Name	Modern
Switch Type	Push Button
UPC	819137020290
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	21 Watts

Reviews

D**N

29.11.2021

U**H

12.03.2026

A**N

7.12.2025

S**E

20.04.2026

J**N

2.11.2020

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