i have a denon avr s940h reciever in an enclosed cabinet with 4 inches from top of reciever to top of cabinet. Will the s9 or t9 work?

4" from the top of your receiver means only 2.5" from the top of the AIRCOM S9. This may be too little clearance for a top-exhaust unit. You say "enclosed cabinet." I assume one side is open. The hot air needs to vent somewhere. If this is true then go with a front or rear exhaust system instead. The AIRCOM S10 is the front-exhaust version and S8 is rear-exhaust. Also, I like the S-Series because it offers all the control over the fans that I require. The T-Series costs more and seems a little overkill. Unless, however, you really like the LCD display.

Will this work in automobile applications

It works off of 120. You should call the company and ask them if they have fans for automotive applications.

does anyone use these fans in a stack? in between 2 components (amp, fan unit, avr for example)?

As long as you have proper clearance I don't see why it wouldn't cool ok. I think it pulls air upwards better than pushing air but I have used it to push air up thru an amp.

Have a receiver in a cabinet with 3.5" space behind it to back of cabinet or about 5" above it to a glass shelf. Top or rear exhaust unit is better ?

This unit exhausts from the top and I have about 1 inch above the unit. It works perfectly. I’ve had no problems with the receiver overheating, since I purchased the fan. If you have 5” above, it should work very well for you.

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AC Infinity AIRCOM S9, Quiet Cooling Fan System 17" for Receivers, Amps, DVR, AV Cabinet Components

AC Infinity AIRCOM S9, Quiet Cooling Fan System 17" for Receivers, Amps, DVR, AV Cabinet Components

Product ID: 259737371

Details

Brand
AC Infinity
Cooling Method
Air
Power Connector Type
3-Pin
Voltage
12 Volts
Wattage
35 Watts

🔇21 dBA ultra-quiet noise

⚙️3 dual-ball bearing fans

🌬️210 CFM airflow

$858.22

Duties & taxes included

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Keep your gear cool, calm, and collected — because overheating is so last season!

PLUG PLAY CONVENIENCE - Includes corded power adapter and easy front-panel controls for seamless integration.
ROBUST COMPACT DESIGN - Durable alloy steel and aluminum build supports up to 30 lbs with a sleek 1.5-inch profile.
PRECISION THERMAL CONTROL - Smart thermostat triggers with 2 modes & 4 fan speeds for tailored cooling.
WHISPER QUIET PERFORMANCE - PWM-controlled motors and silicone mounts reduce noise and vibration to a near-silent hum.
OPTIMIZED AIRFLOW EFFICIENCY - Top-exhaust design pulls heat away from sensitive AV gear, ensuring peak performance.

The AC Infinity AIRCOM S9 is a 17-inch quiet cooling fan system engineered for AV components like receivers, amps, and DVRs. Featuring three dual-ball bearing fans with PWM motors, it delivers 210 CFM airflow at just 21 dBA noise. Its smart thermostat triggers and four-speed settings optimize cooling while minimizing sound. Built with durable alloy steel and aluminum, it fits tight spaces and supports up to 30 lbs stacked on top, extending your equipment’s lifespan and performance.

Specifications

ASIN	B01LVUWOBX
Air Flow Capacity	210 Cubic Feet Per Minute
Best Sellers Rank	#78,054 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #459 in Case Fans
Brand Name	AC Infinity
Compatible Devices	Amplifier, DVR, Receiver
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (571)
Manufacturer	AC Infinity
Material Type	Alloy Steel, Aluminium, Silicone
Max Rotational Speed	210 RPM
Model Number	AI-ACS9
Noise Level	21 Decibels
Number of Items	1
Number of Packs	1
Part Number	AI-ACS9
Power Connector Type	3-Pin
UPC	854759004655
Unit Count	1.0 Count
Voltage	12 Volts
Wattage	35 Watts

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