What is the difference between commercial-grade and residential ergonomic chairs?

Commercial vs. residential ergonomic chair specification at OfficeFurniture2go.com is fundamental. Commercial requires BIFMA X5.1 testing, 1.8+ lb/cu.ft foam, 50,000+ double-rub upholstery, and 5+ year mechanism warranty. Many e-commerce ergonomic chairs meet none of these. We sell only commercial grade and are transparent about the specification differences. Call 1-800-460-0858.