Office Master 7878 Paramount Large Build Multi Function Chair

  • 7878 Paramount  is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor. 
Product ID 14155

NOTE: The above video demonstrates general adjustment capabilities  which vary depending on the model of the chair. The actual functions & appearance of your chair/arm may differ significantly from the video & illustration shown above. For a list of actual capabilities, please see the features list below or call and ask one of our knowledgeable customer service representatives at 1-888-456-3746. (Some options are available as an upgrade option and must be selected at time of purchase).


Office Master 7878 is a Paramount Collection cross-performance chair that has a wide range of adjustable features, including a seat slider, EZ back height adjustment, and a tilting seat and tilting backrest. What really sets the 7878 apart from the rest of the Paramount Collection, though, is its comfortable 5 lb. memory foam layer which makes long hours at work more easy to accept!

Note: Arms sold separately, unless otherwise indicated.


Overall Width 27"
Overall Height 40 - 49"
Back 18" W x 23" H
Seat 21" W x 18-21.1" D
Seat Height 17" - 22"
COM 1.5 yards
Carton Weight 55 pounds
UPS Weight 101 pounds
Arms Groups 1 and 4
Weight Capacity 300 lbs
Warranty 12 years Limited


  • Pneumatic lift
  • Easy back height adjustment
  • Tilting backrest
  • Tilting seat
  • Seat depth adjustment
  • Adjustable lumbar
  • Swivel/rocking tilt
  • Forward tilting
  • Tension knob
  • Double comfort seating (DCS) seat

Product Options/Accessories

Frequently Asked Questions

q My Office Master 7878 Paramount chair arrived recently and I went to assemble it today. When we lifted the seat/back to put it on the cylinder/base, this piece fell out of the seat/back. We could not figure out where it came from. Is someone able to help me troubleshoot this?

I think it might be the ratchet that broke off. We will be sending you a new backrest with the j-bar attached. One more important thing, please do not lift up the chair just by its backrest without supporting the seat. Generally, the weight of the chair is too much to be handled just by the backrest.

Model 7878
Manufacturer Office Master Chairs
Part Number 7878
Overall Width 27"
Overall Height 40 - 49"
Back 18"w x 23"h
Seat 21"w x 18-21.1"d
Seat Height 17 - 22"
COM 1.5 yards
Carton Weight 55 lbs
UPS Weight 101 lbs
Arms Groups 1 & 4
Warranty 12 year limited
Weight Capacity 300 lbs

Customer reviews

  • 1 stars 0
  • 2 stars 0
  • 3 stars 0
  • 4 stars 0
  • 5 stars 1
(5 out of 1)
Excellent product and quality

by Andre A G, California, Mar 17, 2015

A chair that lives up to the price tag.

Limited 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 are covered under a 7-year limited warranty on all structural components as defined below. Budget series include: BC, SG, ST, and WS.

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.

Fabrics and Foam - OM in-stock upholstery & foam cushions are covered by a 5-year normal commercial use warranty. Normal wear and tear on fabrics such as wrinkling, dirt accumulation or gathering is not covered. This includes Truly. Series “Jackets” and “Wraps”. Natural, minor variations may exist in color, surface, grain or texture of upholstery materials. As a result, any such variations are not warranted. COM/COL and graded-in fabrics are not covered.

Claims Procedure - Should any item fail, contact the Dealer from whom it was purchased. A photograph of the damage(s)/issue(s) and of the “born-on” label underneath the seat will be required to help OM determine the cause and extent of any issues. If it is determined that a return is necessary, return that item and its product proof of purchase to the Dealer, whereupon that Dealer will send both to OM, freight prepaid. OM will repair or replace the defective part at its sole discretion and return it to the Dealer, freight prepaid. Please email related photos and details for any warranty claims to [email protected].

Returns - Written authorization from OM is required prior to a Dealer returning any failed or defective parts to OM. Any returned defective part(s) will NOT be accepted without this prior written authorization, or a “Returned Materials Authorization” (RMA) # assigned to it.

Warranty Labor - This warranty exclusively covers the repair or replacement of OM parts as determined by OM and does NOT cover any portion of field labor or service and does NOT cover any portion of field labor or service. For information regarding OM’s non-warranty shop time and related charges, please reference a current copy of OM’s pricebook, in the Terms and Conditions section.

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Gaming Chair ED-7878MX for Big and Tall - Office Master  Maxwell Intensive Use Heavy Duty Chair
Overall Height 38 - 47" 43 - 52" 42.5 - 50.5"
Overall Width 28" 28" 28"
Back 23.5" W x 20" H 23.5" W x 25" H 18" W x 23" H
Seat 24" W x 18-20.5" D 24" W x 18-20.5" D 24" W x 18-20.5" D
Seat Height 18 - 23" 18 - 23" 18 - 23"
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