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Biochemical Research Laboratory The Dow Chemical Company
Noted E. E. D. j
JUN 06 1958
RESURVEY OP BENCH HOOD, BUILDING PRODUCTS SECTION, COATINGS TECHNICAL
SERVICE, 433 BUILDING
File: Chg.: Date:
By:
1213 4-lb-58
J. E. Peterson
Signed Date
Checked Date
PLAINTIFF'S EXHIBIT DOW-1352
PROBIZM
THIS REPORT IS THE PROPERTY OF
THE DOW CHEMICAL COMPANY
The bench hood in the Building Products Section of Coatings Technical Service, 433 Building was surveyed on 1-15-58 (See report. File No. T2.1-1-65, dated 1-22-58) and found to be inadequate. Investigation disclosed that the hood fan had been installed so that it ran backwards. This was corrected and a resurvey of the hood was requested.
ST0000026
CONCLUSIONS
The average face velocity found for this hood on 4-11-58 was 66 fpm with the door wide open, as compared with a recommended velocity of 80 fpm. A face velocity of 80 fpm or more would be assured if a stop were installed so that the hood sash could not be opened more than 25 inches. This procedure is recommended.
Biochemical Research Laboratory T2.1-1-65 Page 2
PRESENTATION OF DATA
On 4-11-58 the bench hood in the Building Products Section of Coatings Technical Service, 433 Building was resurveyed. Results of this survey are presented on the "Hood Survey Data Sheet" included with this report. The figures'shown on the sketches of the hood face are air velocities in lineal feet per minute (fpm). The mean face velocity with the sash wide open was found to be about 66 fpm.
After considering the toxicity and inhalation hazard of materials; handled within the hood, the sources of external and internal air disturbance at the face of the hood, the size ofthe hood, and the variance of face velocity data, the recommended face velocity was calculated to be 80 fpm. At an average volumetric air flow rate of 920 cubic feet per minute (cfm), the sash opening to produce a face velocity of 80 fpm was calculated to be 25 inches.
According to users of the hood, the sash is rarely raised all the way, and therefore, if a stop were installed so that the sash could be raised no more than 25 inches, the hood should be satisfactory in all respects for present uses.
ST0000027
HOOD SURVEY DATA
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HOOD CONDITIONS DURING THE SURVEY
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HOOD CONDITIONS DURING THE SURVEY
ACTUAL PACE VELOCITIES
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EXHAUST RATE OCRING SURVEY MAXIMJU OPENING.- HEIGHT
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SUMVCYOR
___ P<______________
I am an author of and hava raad this raport comprising 3
pages with_____ ^pages of drawings, photographs, graphs, and checked the data herein against the original entries under Biochemical Laboratory File Number_______ ^
Signature. 0
Signature.
Date v/ar/sP
Date
I finished typing this report on.
4-22-58
comprising.
pages and placed therewith.
.pages of
drawings, photographs, graphs from an original draft given me by.
J. E. Peterson
on 4-18-58I
I have pieced in the plant mail.
.copies of this report for
transmittal to please refer to the distribution list of this report.
Signature,JJJLJ
Date
c?.r- s-r
ST0000030
i2n-4q ppirmrr
Biochemical Research Laboratory
T2.1-1-65 Page 3
UNIT INDEX
The bench hood in the Building Products Section of Coatings
Technical Service, 433 Building was resurveyed. The average face
velocity found was slightly less than that recommended, but this
r,
inadequacy could be easily corrected by installing a stop so that
the hood sash could be opened no more than 25 inches.
DISTRIBUTION
R. B. Drubel, Coatings Technical Service, 433 Building N. R. Peterson, Coatings Technical Service, 433 Building H. H. Gay, M.D., Medical Department, 607 Building W. L. Tisdale, Safety Department, 401 Building
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