Does this thing really push 640 cfm's? that seems extremely high for that style fan.

It seems that every seller, of this style of fan, lie through their teeth about the cfms, and can't seem to get their numbers straight. Also, the 4 and 5 star reviews look more like paid reviewers, than people who actually use the fans. They are built cheap, and usually last from a couple of weeks, to at most, a couple of years. Which honestly, for a 21 dollar fan, you can't complain. I'd recommend either going by the vehicle manufacturer's recommendations or ask a mechanic for a recommendation.

Can this be used with a fan speed controller? (Will it run on a range of 5-12v?)

Yes fan speed controller works great. You can even reverse it.

How much does its CFM drop if it's installed to push air?

no cfm drop ,just turn over fan blade

What are the measurements of the shroud?

Don't know, I returned it because it only pushes air in one direction. The blades weren't straight cut, they were pitched.

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Fekuar 6 Inch Slim 650CFM Radiator Cooling Fans Universal Slim Pull Push 12V 80W Direct Replacement Electric Fan with Mount Kit, black

Product ID: 449282620

Details

Brand
Fekuar
Power connector type
3-Pin
Product dimensions
21.5L x 20.5W
Voltage
12 Volts
Wattage
80 watts

⚡80W power efficiency

🌀650 CFM airflow

📏6-inch slim profile

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MOP$606

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Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Cool your ride, rule the road — slim, sleek, and unstoppable.

QUIET EFFICIENT - Runs at 2250 RPM with low noise (50 dB) for a smooth, distraction-free ride.
COMPACT POWERHOUSE - Slim 6-inch design fits tight engine bays, freeing up space for your custom mods.
DUAL MODE FLEXIBILITY - Push or pull installation options for seamless OE replacement or upgrade.
UNIVERSAL COMPATIBILITY - Fits a wide range of classic and hot rod engines from Chevy to Ford with ease.
HIGH PERFORMANCE COOLING - Delivers up to 650 CFM airflow to keep your engine, A/C, and transmission running cool.

The Fekuar 6 Inch Slim 650CFM Radiator Cooling Fan is a versatile, high-efficiency electric fan designed for universal 12V vehicle use. Its slim 6-inch frame allows installation in tight engine compartments, while delivering powerful 650 CFM airflow at 80 watts. Compatible with a broad range of classic and hot rod engines, it supports both push and pull configurations to optimize cooling for radiators, A/C systems, and transmissions. Engineered for quiet operation at 50 decibels and 2250 RPM, this fan is the perfect upgrade for professionals seeking reliable, space-saving engine cooling.

Specifications

ASIN	B087TF2N2S
Air Flow Capacity	650 Cubic Feet Per Minute
Best Sellers Rank	#127,344 in Automotive ( See Top 100 in Automotive ) #119 in Car Engine Fans
Brand Name	Fekuar
Compatible Devices	Engines
Cooling Method	Air
Customer Reviews	4.5 4.5 out of 5 stars (621)
Item Dimensions L x W x H	21.5L x 20.5W x 6.5H centimeters
Item Weight	1 Ounces
Manufacturer	Fekuar
Material Type	Plastic
Maximum Rotational Speed	2250 RPM
Model	UB0614
Noise Level	50 Decibels
Number of Items	1
Part Number	UB0614
Power Connector Type	3-Pin
Unit Count	1 Count
Voltage	12 Volts
Wattage	80 watts

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