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CANOPY PLATES AND FRAMES.
    1. For all dimensions, calculate each prism light an even four (4) inches, adding one-half (½) inch all around for iron border of prism plate.
    2. All canopy prism plates containing over five (5) square feet should have intermediate supports, so that no area of more than five (5) square feet of plate will be unsupported.
    Bars may be glazed into prism plates at intervals to receive supports from above or beneath. (See detail sheets of canopies.)
    Even when stiffening bars are used no single prism plate should exceed fifteen (15) square feet in area.
    3. The iron border is one-half (½) inch wide by one-quarter (¼) inch thick.
    4. The sight opening of frames to which the prism plate border is secured should clear prisms one-sixteenth (1/16) inch all around. See detail sheets of canopies.
    5. Provision should be made in designing canopy supports for allowing an adjustment, at the building, of at least ten degrees in the slope or pitch of frame carrying the prism plates. This is allowed for in examples shown, either by shifting the point of support at wall line or on canopy frames, or by increasing or diminishing the length of supporting members.
    6. The following schedule of structural iron should be used for canopy frames:
For spans up to 36 inches, 1×1×1/8 Angles and Tees.
" " " 48 " 1¼×1¼×¼ " " "
" " " 60 " 1½×1½×¼ " " "
" " " 72 " 1¾×1¾×¼ " " "
" " " 84 " 2×2×¼ " " "
" " " 96 " 2½×1½×5/16 " " "
    All the above dimensions are in inches.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 22