Table 2. Tolerances for Filter Cases

DOE-STD-3020-97

TABLE 2. Tolerances for Filter Cases

a. Face Dimensions:

i. less than 18 in.

+0, - 1/16 in. (1.6 mm)

(45.7 cm)

ii. greater than 18 in.

+0, - 1/8 in. (3 mm)

(45.7 cm)

b. Depth:

+1/16 in. (1.6 mm), -0

c. Width of gasket surface: 3/4 in. (19 mm) 1/16 in. (1.6 mm)

d. Squareness:

face diagonals to be equal with the following total tolerances.

i. less than 18 in.

1/16 in. total (1.6 mm)

(45.7 cm)

ii. greater than 18 in.

1/8 in. total (3 mm)

(45.7 cm)

e. Gasket seating surfaces: Square with sides of frame (within 3o).flat and parallel.

1/16 in. (1.6 mm) total allowance when measured with one face

of the filter resting on a flat surface.

Wooden Cases. Case panels shall be joined with rabetted

5.4.3.1

joints which are assembled by gluing with an adhesive

meeting the requirements of Section 5.3.4 of this standard

and double nailing or double screwing with coated box nails,

corrosion resistant plated screw-nails, or flathead wood

screws. The end points of the fasteners shall not penetrate

the inside or outside surfaces of the case. Frame faces,

edges, and inner surfaces shall be thoroughly coated with

sealant to minimize permeability. Frame face sealant shall

not reduce the ability of the gasket to adhere to the frame.

There shall be no splinters or rough edges that might

penetrate or cut workers' gloves or injure the fingers of

personnel handling the filters.