Everest Big and Tall High Back Task Chair

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The Everest High Back Task Chair was designed for big and tall users. Built entirely out of steel, it has 25" wide x 22" deep seat. A seat having the same width but 19" deep is available to accommodate shorter persons. It is equipped with a heavy duty multi-function mechanism, heavy-duty gas cylinder and a metal base with HD casters for sturdiness and durability. Available in a choice of adjustable arms and a variety of fabrics (see fabric selector above). 5 Year Warranty. 


  • 24-7 multi-function heavy duty chair
  • A.D.I. patented “suspension” seat technique, 14 gauge steel structure
  • Fabric seat covers with zipper on underside, available in "Reflex" textiles, Canter health grade vinyl and premium leather
  • Standard with 27" cast aluminum base and 3" heavy duty casters
  • Standard with larger seat, optional short seat depth available
  • 500 lbs user rating
  • Heavy duty mechanism with ratchet back
  • 120mm 500N cylinder, optional 80mm heavy duty cylinder available


  • overall 32"W x 24"D x 42.5"H
  • seat width 25"
  • seat depth 22", optional 19"D
  • seat height range 20.5- 23.5"
  • distance between arms 24"
  • backrest height 21.5"
  • backrest width 22"

Adjustment Mechanisms:

  • Pneumatic Seat Height Adjustment - Moves the seat up and down to adapt to various body height  
  • 360 ° Swivel -Provides freedom of movement in any direction 
  • Front and Rear Tilt - Tilts seat forward and back to recline
  • Tilt Tension - Controls the rate and ease of recline
  • Optional Adjustable Lumbar Support - Easily adjusts to enhance comfort and support lower back
  • Optional Seat Slider Pan - Moves the seat cushion forward or back +2” and -3⁄4” from the standard position
  • Backrest Tilt - Tilts backrest independently

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Arm Options:

  • 01 Width/Height Adjustable, Standard Pad
  • 01S Width/Height Adjustable, S Pad
  • 04 Width/Height Adjustable, Gel Pad;
  • 16 Folding Arm Width/Height Adjustable, Standard Pad
  • 17 Folding Arm Width/Height Adjustable, Contoured Pad
  • 18 Folding Arm Width/Height Adjustable, Gel Pad

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Buying A.D.I. means buying durability. All A.D.I. products are designed to ANSI/BIFMA standards and carry a lifetime warranty on the steel structure, suspension belts, base, mechanism, casters and gas cylinder, and a 5-year warranty on carded fabrics (normal wear). Big and tall and 24/7 chairs are covered by a 5-year warranty on all parts.