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3524-3 Extension Ladders - Keller US
3524-3 Extension Ladders - Keller US


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3524-3 24ft Type II Aluminum D-Rung Extension Ladder


SizeStyleMax. Safe Working HeightLoad Capacity
24ftMulti Section20ft225lb Load Capacity Commercial Use

The 3524-3 Aluminum Extension Ladder is a compact, 3 section ladder that has a duty rating of 225 pounds and interlocking side rails. The D rungs are slip resistant and the spring-loaded locks operate smoothly for easy operation. Shoes rest flat or are heldin spur position with the swiveling shoes feature. Mar-resistant end caps also help protect the surface the ladder is leaning against. Exclusive 3-piece rung-to-rail connection means twist-proof performance every time.


  • Compact design retracts to 9 feet 3ines, 3 feet shorter than a conventional, 2 section, 24 foot extension ladder
  • Same usable length as a conventional, 2 section, 24 foot ladder
  • Easy to maneuver around corners and through doors
  • Versatile design for indoor or outdoor use
  • More overlapping rung locations for improved foot comfort
  • Convenient carry handle
  • Exclusive 3-piece rung-to-rail connection means twist-proof performance
  • 1-3/4in slip-resistant D-rungs
  • Durable extruded rung locks are spring loaded to operate smoothly
  • Mar-resistant end caps
  • Durable shoe rests flat on slip resistant pad or is heldin spur position with swiveling shoe feature


FeatureSize / Details
Max. Safe Working Height20ft
Max. Open Extended Length21ft
StyleMulti Section
Load Capacity225lb Load Capacity Commercial Use
Duty RatingType II Duty Rating
Approx. Product Weight (lb)43.6
Approx. Shipping Weight (lb)43.6
Base Width18in
Max. Load225lb
Section x Rungs3 x 8
Rung Dimension15-1/4in x 1-1/2in

Package Contents

Part NumberQtyDescription



Additional 3500-3 Series Models

Model No.SizeMax. Safe Working HeightMax. Open Extended LengthStyleApprox. Product Weight (lb)Approx. Shipping Weight (lb)
3524-324ft20ft21ftMulti Section43.643.6

Different types of ladders are designed to keep you safe and productive when climbing or standing. Using the wrong style of ladder or simply ignoring the limitations of climbing equipment can result in a fall or serious injury.
Height reach Height is referring to the actual ladder height. Extension ladders should be 7 to 10 feet longer than the highest support or contact point, which may be the wall or roof line. The highest standing level is four rungs down from the top. The highest permitted standing level on a stepladder is two steps down from the top.

Reach height is the maximum reach assuming a 5’6” person with a vertical 12” reach.
Ladders are designed to safely hold up to a specific amount of weight. The Werner Performance System defines five different capacities using a color and star rating system. The Duty Rating is defined as the maximum safe load capacity of the ladder. A person’s fully clothed weight plus the weight of any tools and materials that are carried onto the ladder must be less than the load capacity.

Performance system
Werner offers ladder made from fiberglass and aluminum. Each material has characteristics which make it best for certain applications, or one material may simply fit the personal preferences of the user. For example, if working around electricity users should select fiberglass products due to their non-conductive side rails.