A linear foot is 12 inches wide and 25 inches deep because the standard depth of kitchen countertops is 25 inches.
The Americans with Disabilities Act Accessible Guidelines state that space at least 30 inches wide should be accessible, meaning that wheelchair users can roll up to the counter to perform tasks. The counter should be between 28 and 34 inches high and accommodate a minimum 27-inch knee clearance below the counter, sink or cabinet space. Anything beyond the first 16 inches of counter depth, from the front edge, is considered dead space for wheelchair users.
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