The accompanying table provides dimensions values for clear floor area to accommodate 95% of power chair (n=189), scooter (n=30), and manual chair (n=276), users that were measured as part...
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  Clear Floor Space: Minimum Clear Floor Space Required for Forward and Side Approach - Power Chair
  
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  407.12.1.2 Vertical Plane for Forward Reach (Section-by-Section Analysis)
  The 30-inch dimension is based on the width of a stationary occupied wheelchair.... 
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  11B-407.4.6.2.1 Size and shape
  Buttons shall have square shoulders, be ¾ inch (19.1 mm) minimum in their smallest dimension and be raised 1/8 inch (3.2 mm) plus or minus 1/32 inch (0.8 mm) above the surrounding surface... 
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  11B-302.3 Openings
  Elongated openings shall be placed so that the long dimension is perpendicular to the dominant direction of travel. Advisory 11B-302.3 Openings.... 
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  M305.2.4 Cross Section (Section-by-Section Analysis)
  of 2 inches maximum, and a perimeter dimension of 4 inches minimum and 4.8 inches maximum.... 
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  11B-303.5 Warning curbs
  Abrupt changes in level exceeding 4 inches (102 mm) in a vertical dimension between walks, sidewalks or other pedestrian ways and adjacent surfaces or features shall be identified by warning... 
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  5.4.6 Transfer Support Gripping Surface Cross Section and Clearances for M301, M302, and M305.2
  Grab bars with non-circular cross sections must have a cross section dimension of 2 inches maximum and a perimeter dimension of 4 inches minimum and 4.8 inches maximum.... 
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  Transfer Surface Size: Equipment Used by Patients in Supine, Prone, or Side-Lying Position (M301.2.2) 
  The transfer surface dimensions do not include headrests, footrests, or similar supports for body extremities that do not support the patient’s overall body position.... 
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  36 Inch Wide Stalls
  A 36-inch width (absolute) allows the parallel grab bars to be used simultaneously when changing from a standing position to a seated position and vice versa.... 
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  Clearances Around Gripping Surfaces
  The 2004 ADA and ABA Accessibility Guidelines specify the following clearances around grab bars to ensure sufficient space for a person to grasp the grab bar: 1½ inches absolute clearance... 
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  4.3.3 Clear Floor Area 
  The 95th percentile dimension values for occupied length and breadth provide a reasonable threshold value for determining the dimensions for clear floor area length and breadth.... 
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  § 36.311(b)(2)(i)
  (i) The type, size, weight, dimensions, and speed of the device;... 
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  § 35.137(b)(2)(i)
  (i) The type, size, weight, dimensions, and speed of the device;... 
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  11B-405.7.2.1
  Handrail extensions are not permitted to obstruct required clear landing dimensions except as allowed by the exception to Section 11B-307.2.... 
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  Verify Framing
  bars in bathtub/shower rooms. 11B-610 Width and depth of shower stalls. 11B-608.2 Drinking fountain alcoves/wing walls. 11B-602.9 Tread dimensions... 
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  Verify Framing
  bars in bathtub/shower rooms. 11B-610 Width and depth of shower stalls. 11B-608.2 Drinking fountain alcoves/wing walls. 11B-602.9 Tread dimensions... 
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  608.2.2 Standard Roll-In Type Shower Compartments
  Standard roll-in type shower compartments shall be 30 inches (760 mm) wide minimum by 60 inches (1525 mm) deep minimum clear inside dimensions measured at center points of opposing sides... 
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  Section 4.26.2
  Handrail gripping surfaces with a non-circular cross section must have a perimeter dimension of 4 inches to 6 ¼ inches, and a cross section dimension of 2 ¼ inches maximum.... 
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  608.2.3 Alternate Roll-In Type Shower Compartments
  Alternate roll-in type shower compartments shall be 36 inches (915 mm) wide and 60 inches (1525 mm) deep minimum clear inside dimensions measured at center points of opposing sides.... 
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  R103 Conventions (Section-by-Section Analysis)
  R103 Conventions (Section-by-Section Analysis) Conventional industry tolerances apply where dimensions are not stated as a range.... 
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  407.4.6.2.1 Size
  Buttons shall be ¾ inch (19 mm) minimum in their smallest dimension.... 
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  11B-409.4.6.1 Size
  Control buttons shall be ¾ inch (19.1 mm) minimum in their smallest dimension.... 
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  § 36.311(c)(1)
  (1) The dimensions, weight, and operating speed of the mobility device in relation to a wheelchair;... 
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  § 35.137(c)(1)
  (1) The dimensions, weight, and operating speed of the mobility device in relation to a wheelchair;... 
