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OM Seating  |  SKU: AF504

Office Master Affirm Mid Back Ergonomic Office Chair | AF504

$440.70

Office Master Affirm Mid Back Ergonomic Office Chair (AF504) offers simple, dependable ergonomic support with a frameless mesh back and premium Malibu Knit Jacket upholstery, paired with JR-49 arms for a refined, professional look. Designed for professional workspaces—from tech startups to healthcare and education—it blends modern style with all-day comfort.

Highlights

  • Simple mid-back
  • Pneumatic lift
  • EZ back height adjustment
  • 1-stage locking tilt
  • Synchronous seat/back tilt
  • “Frameless” mesh back design
  • Seat depth adjustment
  • Dual-tone universal soft casters
  • Nightfall black mesh is default
  • Tension knob
  • Weight Rating - 300 lbs.

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Dimensions

Model/Sku: Office Master AF504
Overall Width: 27"
Overall Height: 38.25-45.75"
Back: 19.75"w x 20.5"h
Seat: 19"w x 17.5-20.6"d
Seat Height: 17-22"
Carton Weight: 57 pounds
Warranty: 12 year limited
Chair measurements shown are approximate. They're based on the same chair, base, and casters, with only the cylinder height varied. Arm dimensions are also approximate, since actual measurements can vary depending on factors like cushion contour, seat upholstery, memory foam, and similar variables.

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Warranty

Office Master, Inc. (OM) warrants to the original purchaser that its products are free from defects in materials and workmanship for the applicable warranty period, as indicated below. Should any item fail, OM will – at its sole discretion – repair or replace, with a comparable product or part, any item found to be defective as a result of normal commercial use (i.e., a single 8-hour shift, 5 days per week). This warranty does not apply to items subjected to abuse, misuse, neglect, alteration, or damage caused by shipment, storage, accident, fire, flood, or act of God.

Lifetime Limited Warranty
The OM5 Series® (including the OM5 Active sub-series), Truly.® Series, and Ginny are covered by a lifetime limited warranty on all structural components as defined below.

12-YEAR LIMITED WARRANTY
Unless otherwise specified, all models not classified as budget or 24/7 or heavy-duty are covered under a 12-year limited warranty on all structural components as defined below.

7-YEAR LIMITED WARRANTY
Unless otherwise specified, all models classified as budget or 24/7 or heavy-duty or bariatric are covered under a 7-year limited warranty on all structural components as defined below. Budget series include: BC, SG, ST, and WS. Bariatric series includes: GY4B-26 and GY4B-30.

WARRANTY TERMS
Within a given model’s applicable warranty period, all structural components, including gas cylinders, wood, metal and plastic parts (i.e., chair frames, bases and control handles) are guaranteed against structural failure when under normal commercial use. All OM seating comes with a default 275 lbs. weight capacity limit unless otherwise specified by OM. For all models, consumable items (i.e., casters, glides, etc.) are covered by a 5-year normal commercial use warranty.

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