Are there heavy-duty conference chairs rated for 400 lbs.?

Yes — heavy-duty conference chairs rated for 400 lbs. feature reinforced steel frames, wider seat pans (21–24 in.), and higher-capacity gas cylinders rated for greater loads. Some models reach 500–600 lb. capacity for bariatric applications. BIFMA G1 classifies these as 'large user' designs. OfficeFurniture2go.com carries heavy-duty conference seating — call 1-800-460-0858.