The answer is found in the ADA Accessibility Guidelines for Buildings and Facilities, written by the Architectural and Transportation Barriers Compliance Board (Access Board), published July 26, 1991; Section A4.2.4 Clear Floor or Ground Space for Wheelchairs.
4.2 Space Allowance and Reach Ranges.
A4.2.4 Clear Floor or Ground Space for Wheelchairs.
“The wheelchair and user shown in Figure A3 represents typical dimensions for a large adult male.”
A similar figure is found in ICC/ANSI A117.1-2003 Commentary, Section 102 Anthropometric Provisions:
102 Anthropometric Provisions.
“The technical criteria in this standard are based on adult dimensions and anthropometrics.”
Also, Figure C102(a) shows eye level at 43 – 51 inches.
So, in the opinion of ACCESS, the design for eye level should be 47 inches above finish floor to the centerline of the peep hole, or 46 inches when measured from the bottom of the door.
The distance from the centerline of the eye to the mouth is approximately 3 inches; therefore in the opinion of ACCESS, the centerline of the speaker hole in the glass design dimension should be 44 inches above finish floor.
If you have any comments or thoughts on the above posting, please post here or on our FaceBook page at http://www.facebook.com/pages/Access-Technologies-Services-Inc/268659564730. Or you can contact us at hfalstad@accessts.net or call us at (702) 649-7575.
Hank
The above are opinions of Hank Falstad , AIA, Managing Senior Associate of Access Technologies Service s, Inc. (ACCESS). See our web site for additional information: www.accessts.net.
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