Office master

Office Master Affirm Simple Midback Stool w/ Adjustable Foot Ring

$614.00 $399.10 (You save $214.90)
Availability: Usually ships within 2 to 4 Business Days
Current Stock:
Chair Fit: Average Chair Fit: Tall Max Weight: Up to 250 lbs
Width: 27.00 (in)
Height: 46.00 (in)
SKU: AF515
Full Description
Standard Back Mesh Color Choose a color *
Seat Fabric Options Choose a color *
Optional Mesh Back Jacket Choose a color

The Office Master Affirm Simple Midback Stool features the same modern, sleek, frameless mesh design common to the Affirm chair family. This stool will look great in nearly any workspace – whether a tech start-up, a healthcare environment, an educational facility, an architectural firm or a more traditional office place it’s the perfect combination of class and comfort. A wide variety of options allows you to fit your style and purpose. Configure this chair to make it uniquely yours.

The OM Affirm Midback Stool Features:

  • Design - Contemporary frameless rectilinear design
  • Seat Design - Designed with extra waterfall curve for added comfort
  • Height Adjustable Back - EZ back height adjustment
  • Stool Height Adjustable - Seated height from 25.5" to 35.5"
  • Seat Depth Adjustable - Available with seat depth adjustments for better comfort
  • Synchro Tilt - Available with synchronous seat and back tilt to adjust to your fit
  • Infinitely Locking Back Tilt - Affirm Simple Midback Stool comes with a locking back tilt
  • Pneumatic Lift - Comes with a pnematic lift to adjust
  • Adjustable Foot Ring - Available with a adjustability foot ring added adjustability
  • Fabric Options - Available is various color fabric options and textile grades

Chair back standard mesh colors:

Choose from Nightfall Black or Starlight Silver.

Standard mesh back colors for Office Master Affirm Series Chairs

Arm Options:

Choose from no arms or one of a wide variety of arm options to suit your needs. Please note, additional charges apply.

  • Ar-11:   Fixed height arm
  • KR-21:  Contoured height adjustable T arms. Adjustable height range = 2.25"
  • KR-25:   Contoured height adjustable T arms featuring natural grip control. Height adjustment range = 2.75"
  • KR-445: Width adjustable T arms with smooth fore-aft, side-side, and pivoting motion arm caps. Adjustable height range of 2.75". Adjustable width range of approximately 1" per side.
  • JR-49:    Forward-slanting T-arms with smooth fore-aft, side-side, and pivoting motion arm caps. Adjustable height range of 4.25''. Adjustable width range of 1.75'' each side.

Office Master arm options

Caster Upgrade Options



Multi-Surface Soft Caster
Dual-colored; designed for wood, tile and
smooth or harder surfaces. For most stools.
(5 per set)

Add an upholstered jacket to your Affirm Stool back:

Upgrade to add one of these pretty mesh backs. Each zip on and off your standard chair back for a style change in seconds!

Choose your color for your OM Affirm chair back jacket

OfficeMaster Seat Fabric Options:

Officemaster has a huge selection of fabrics to choose from to make your ergonomic chair uniquely yours. Choose from a variety of fabric types and grade options. These fabric choices are endless! There are more options then what is listed. Please contact Ergoprise if you would like to order a fabric not listed. Bring your own fabric is also available adding to the flexibility of design of your OfficeMaster chair.

Grade 1 Fabric Options:

Grade 1 - Basic 1001-1020

Content:100% Marquesa Lana Backing: Acrylic Width: 54" Finish: Teflon Abrasion:250,000 Double Rubs

Lightfastness:40 Hrs. - Class 4 Flammability: Passes California 117-E; CS-191-53

Office Master Grade 1 Basic colors

Grade 1 - Spice 1161-1168

Content: 100% Polyester Backing: Acrylic w/ Teflon Abrasion: 400,000 Double Rubs
Lightfastness: 60 Hrs. - Class 5 Flammability: Passes California 117-E; CS-191-53; BIFMA X5.7-1991; NFPA 260, CLASS 1; UFAC, CLASS 1

OM Grade 1 Spice fabric choices

Grade 2 Fabric Options:

Grade 2- Chess 2291 - 2299

Content: 80% Recycled Polyester, 20% Olefin Backing: Acrylic Finish: Teflon Abrasion:114,000 Double Rubs
Rating: Heavy Duty Lightfastness: 40 Hrs., Class 5 Flammability: Passes: California 117-E; UFAC Class 1

Officemaster grade 2 fabric Chess colors 

Grade 2- Knack 2542 - 2548

Content:100% Polyester Backing:Acrylic Finish: Soil and Stain Resistant
Abrasion:100,000 Double Rubs Rating: Heavy Duty Lightfastness: 40 Hrs., Class 5
Flammability:Passes California 117-E; UFAC Class 1; NFPA 260 Class 1


Grade 2- Softsit Fabric 2570 - 2577

Content:100% Polyester Backing:None;Abrasion;100,000 Double Rubs (Cotton Duck)
Lightfastness: Grade 4 min. at 20 Hours Flammability: Passes CA Technical Bulletin 117-E

OM fabric choices grade 2 Softsit 

Grade 3 Fabric Options:

Grade 3- Symphony 3V20 - 3V28

Content:100% Vinyl Backing:100% Brushed Polyester Knit Abrasion:100,000+ Double Rubs
Lightfastness:UV-Resistance 1000 Hours
Flammability:Passes California 117-E; BIFMA; UFAC, CLASS 1; MVSS 302; NFPA 260; IMO A.652 (16) 8.2 & 8.3; May Comply with California 133 when tested with suitable components; Can be treated to pass FAA 25.853

Officemaster fabric grade 3 Symphony 

Grade 3- Stage 3V50 - 3V59

Suitable for Healthcare use

Content:100% Vinyl/Urethane Topcoat Backing:100% Polyester Hi-Loft (TM)Finish:SILVERGUARD (R) & PERMABLOK3 (R)Abrasion:930,000 Double Rubs
Lightfastness: Passes 1000 Hours
Flammability:Passes California 117-E (Equivalent to BIFMA); NFPA 260 (Equivalent to UFAC) Class1; Boston Fire Dept. Code (BFD 1X-1); FAA/FAR 25.853 (a); Fed. Stnd. 191A Test Method 5903.1 - Vertical Flammability Test; FMVSS 302; IMO A. 652(16) 8.2 & 8.3; NFPA 701 (sma