Kobalt KBB 4240-06 Spec Review

The Kobalt KBB 4240-06 is a cordless backpack leaf blower delivering 690 CFM at 135 MPH. It features a 4 Ah 40 V Li-ion battery. (Read full specs)

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Kobalt KBB 4240-06 690 CFM Cordless BlowerKobalt KBB 4240-06 690 CFM Cordless BlowerKobalt KBB 4240-06 690 CFM Cordless BlowerKobalt KBB 4240-06 690 CFM Cordless Blower
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Features and Specifications

Type Cordless
Handling Backpack
CFM Up to 690
MPH Up to 135
Blowing Force N/A
Voltage40 V
Speed settings Variable
Battery Li-ion
Autonomy 200 mins
Throttle positionTube
Cruise controlYes
Vacuum No
Battery included 2
Weight (w/ battery)22 lbs
Weight (tool only)16.4 lbs
Noise rating 76 dB
Warranty 5 years

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue. Should you wish more detailed specs on the Kobalt KBB 4240-06, the user manual is available here (opens in a new tab).


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Overview of the Kobalt KBB 4240-06

  • Power: The Kobalt KBB 4240-06 is a cordless blower with a maximum air volume rating of 690 cubic feet per minute (CFM) and an air speed of 135 MPH.
  • Power delivery: Kobalt designed this unit and its brushless, battery-operated motor with top-of-the-food-chain maneuverability in mind. The KBB 4240-06 doesn’t need to be plugged in, so you can take it anywhere easily.
  • Battery: Its 4 Ah 40 V Li-ion battery (2 batteries included) enables the blower to run for up to 200 minutes without needing to recharge.
  • Handling: Like most backpack blowers, this model is technically heavier than a handheld. That being said, it can feel lighter and more comfortable because of the way it is carried, even when used over extended periods of time. Its throttle is located on the tube, which allows you to keep your left hand free.
  • Speed Settings: To provide more control over their job to the user, the unit has a variable speed control setting. No matter the size of the job, the user can adjust the airflow of the Kobalt KBB 4240-06 to match it. On top of that, maintaining the selected speed is effortless, as it also features cruise control.
  • Noise: With a decibel rating of 76 dB, the KBB 4240-06 is neither louder nor quieter than its rivals in the electric backpack category.

Product Videos

The Kobalt KBB 4240-06's performance versus other blowers

The following charts are provided to give you an idea how the key specs of the Kobalt KBB 4240-06 compare with similar leaf blowers.

  • The air speed of the Kobalt KBB 4240-06 maxes out at 135 MPH. While more than adequate for many jobs, its air speed is below average among other battery-operated backpack blowers. For the fastest air speed in this category, you may want to consider the Ryobi RY404170, which can expell air at a velocity that can reach 165 MPH.
  • If air volume is an important feature, the KBB 4240-06 by Kobalt will not disappoint. Its airflow maxes out at 690 CFM (cubic feet per minute), which is more powerful than most cordless backpack blowers. If air volume is important to you, the Worx WG572, with 800 CFM, could be in your good books.
  • Thanks to its autonomy of up to 200 mins, the KBB 4240-06 benefits from a higher run time than many cordless backpack units. If autonomy is an important factor for you, the Worx WG572 can run for up to 230 minutes and could be worth considering.

Price comparison

As you can see from this interactive chart, when compared to other cordless backpack blowers, the Kobalt KBB 4240-06 is on the average side of the price range.

Therefore, this blower nicely fits in the expected budget for this kind of product.

The bottom line

  • In the expected price range
  • Brushless motor
  • Cruise control
  • 5 year (limited) warranty
  • High CFM (690 CFM)
  • Excellent autonomy (200 mins)
  • Acceptable noise (76 dB)
  • Low MPH (135 MPH)

Do you own the Kobalt KBB 4240-06 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

About Kobalt

Kobalt is an American brand launched in 1998. Kobalt is the product of a partnership between Lowe’s, a leading seller of home improvement and outdoor products, and J.H. Williams, which is one of Lowe’s primary manufacturers. As one of Lowe’s primary outdoor equipment brands, Kobalt has positioned itself to be a major competitor of Craftsman, Husky, and other similar popular brands.

Warranty Information

The Kobalt KBB 4240-06 is covered under a warranty for up to 5 years. This warranty may not cover all parts of the blower.
For more information about the warranty of Kobalt blowers, please consult Kobalt's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-888-3-KOBALT (888-356-2258).

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