TIME Fireback (2' from bottom) 6" from side of firebox 6" above firebox Side of fireplace (18" of block) back of firebox (10" from fireback) front of chimney (4" width block) Side of chinney (13 1/2" from flue liner) Air temp 10' from fireplace Wall temp 10.5' from fireplace Overall household air temp (20' from..)

8am 9am 10am 11am 12 1pm 2pm 3pm 96 315 319 355 370 342 327 415 74 79 79 81 83 83 87 89 77 83 89 99 108 112 118 123 71 73 75 76 77 77 77 79 88 91 93 104 118 136 149 154 73 76 81 87 90 91 94 95 70 73 74 75 77 77 79 79 69 78 82 84 87 85 87 89 - 82 87 87 95* 92 95 100 - - 69 69 71 71 72 73

NOTES Temperatures in F Fireplace warm from fire night before Started fire after 8am Added 2-3 pieces of wood each hour *moved measuring point on wall 3/13/03 Jim The results of my home test are attached. I returned the laser to the owner, so I'll have to call him to get a name and a manufacturer. Some of the notable things about the test for me was the effect of the thicker masonry (see side of chimney & side of fireplace readings.) I will say that after reading the temperature at the back of the firebox, I am glad that I had the mason leave the 4" clearance between the masonry and the back wall. U.S. Gypsum states that "the maximum continued temperature at which wallboard can be exposed is 125 F." On the performance end, the temperature reading of the sheetrock wall which faces the fireplace from 10.5' away validates the radiant effect of the rumford design. I suppose to test it under a worst case scenario, someone would have to have reproduce an actual chimney fire, and take measurements of that. I'll let someone else do that.*

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