Document 1Eo2BOnzQY4ErdQmnwQzMoDm

UNDERWRITERS* LABORATORIES, INC. 303 mNCSTVN HMD NORTHMOOK. ILLINOIS 800*2 * an independent, not-for-profit organization testingfor public safe^ January 5, 1972 R4339 Mr. Thomas P. Felt - Manager Technical Services Zonollte Construction Products Div. W. R. Grace <e Co. 62 Whlttemore Avenue Cambridge, Mass. 02140 Subject R4339 MK&-Floor Ceiling Design No. 205-3 Hr. Dear Mr. Felt: This will confirm that Mono Kote 4 is acceptable for use in Floor and Celling Design No. 205-3 Hr, as described on Page 280 of the January 1971 "Building Materials List," with the following changes: 1) Item 1 - as an alternate to the described regular weight concrete, lightweight concrete may be used. 2) Item 3 - the description under "Steel Floor units" is applicable except for the last sentence. That is the floor may not be composed of all cellular units. 1 3) Item 8 - as an alternate to the presently described Mono Note 3, the asbestos free Mono Note 4 may be used applied at a minimum average (dry) density of 20 pcf with minimum individual density of 18 pef Very truly yours, ROBERT M. BERHINIG r^T Engineering Group Leader\/ Fire Protection Department RMB:Jb 250*9943