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

$78.97

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

QUIET YET MIGHTY - Operates at a low 50 dB noise level for a smooth, distraction-free ride.
VERSATILE FITMENT - Universal push or pull installation compatible with most classic and hot rod engines.
COMPACT POWERHOUSE - Slim 6-inch design fits tight engine bays without compromise.
PLUG PLAY UPGRADE - Direct 12V, 3-pin replacement with included mount kit for hassle-free installation.
MAXIMUM COOLING EFFICIENCY - Delivers a robust 650 CFM airflow to keep your engine chill under pressure.

The Fekuar 6 Inch Slim 650CFM Radiator Cooling Fan is a high-performance, universal electric fan designed for tight engine spaces. With a powerful 650 CFM airflow, 80W power draw, and a quiet 50 dB operation, it efficiently cools your entire engine bay. Its slim 6-inch diameter and push/pull compatibility make it an ideal direct replacement for a wide range of classic and hot rod engines, ensuring optimal temperature control and enhanced engine performance.

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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