Ergonomic Is Not a Standard: What the Word Has to Mean
No body certifies an ergonomic chair and no test defines one. OSHA and CCOHS publish checklists instead. What those checklists ask, and what a chair needs to fail.
Office Chairs
Heavy Duty Office Chair: Heavy Duty According to Whom
Heavy duty is not defined by any standard, any body or any test. What sellers usually mean by it, and the four component facts that would actually support it.
Big and Tall Chairs: What Is Structurally Different
Not just wider. The base, the cylinder, the mechanism plate and the caster set all change, or they should. Which parts a maker actually upgraded, and how to check.
Task, Executive, Ergonomic, Conference: Retail Categories
Four category names on every furniture site, and not one of them is defined by a standard. What each usually implies about the hardware, and where it stops.
Office Chair Warranty: What Lifetime and Frame Only Mean
A twelve year warranty is usually several different warranties. Read the component split, the hours-per-day clause and who pays freight before you read the headline.
EN 1335 Type A, B and C: Not the European BIFMA
EN 1335 is three documents, and the Type A, B and C letters describe how much the chair adjusts, not how well it is built. What the rating does and does not say.
BIFMA Certified: What X5.1 Tests and What It Never Rates
BIFMA publishes a standard, it does not certify chairs. What ANSI/BIFMA X5.1 actually does to a chair, and the four things the badge cannot tell you.
Waterfall Seat Edge: A Shape, Not a Specification
Waterfall edge appears on nearly every chair listing. It describes a curve with no defined radius, no standard and no published number. What it does mean.
Office Chair Headrests: Fixed, Adjustable, and When Useless
A headrest is only reachable at recline angles the chair can actually hold. Which mechanism the chair has decides whether the headrest is a feature or decoration.
Office Chair Foam Density: The Number Listings Leave Out
High-density foam is on every listing. Density is a real measurable property and almost no chair maker publishes it. What the word hides, and what to read instead.