NEC Display Solutions of America, Inc.UM361X, UM351W & UM352W Installation GuideDesktop and Ceiling Mount v1.0www.necdisplay.com UM361X, UM351W, UM352W Page 2 of 8Ceiling Mounted InstallationThe following diagram shows the relationship between projector position and the screen. Refer to the charts below for data.Distances are in inches. For millimeters multiply by 25.4.Projection Formulas:A = C-13.52B = 0.4229W+4.174C = 0.360WD = 0.1104W+4.174Distance Chart for Popular 16:10 Screen SizesNote: For screen sizes not indicated in the distance charts, use the formulas on page 1.Diagonal Width Heightinch inch inch inch inch inch inch58.0 49 31 4.19 24.97 17.71 9.6060.0 51 32 4.80 25.69 18.32 9.7965.0 55 34 6.32 27.48 19.84 10.2670.0 59 37 7.85 29.28 21.37 10.7375.0 64 40 9.38 31.07 22.90 11.2080.0 68 42 10.90 32.86 24.42 11.6685.0 72 45 12.43 34.66 25.95 12.1390.0 76 48 13.96 36.45 27.48 12.6095.0 81 50 15.48 38.24 29.00 13.07100.0 85 53 17.01 40.04 30.53 13.54105.0 89 56 18.53 41.83 32.05 14.00110.0 93 58 20.06 43.62 33.58 14.47C DScreen Size A B