What is the right amount of knee clearance under a desk?

ADA and ergonomic standards require a minimum of 27 in. of knee clearance height, 30 in. of knee clearance width, and 19 in. of depth under a desk for seated wheelchair access. For standard non-wheelchair users, 24 in. height and 24 in. depth clearance is comfortable. Avoid placing CPUs, pedestal drawers, or cable conduits in the knee clearance zone. OfficeFurniture2go.com offers desks with proper knee clearance dimensions — call 1-800-460-0858.