Media Velocity (Effective Media Area)

DOE-STD-3020-2005

5.4.2.3

Media Velocity (Effective Media Area): The total effective

media area provided within the filter pack shall be such that average

face velocity (rated airflow divided by the effective filter media area)

shall not exceed 5.0 ft/min (1.52 m/min) at the rated airflow.

5.4.3

Filter Case: The case shall be fabricated in accordance with the provisions

of Section 5.3.2. The completed case, less gaskets, shall conform to the

dimensions listed in Table 5.1, unless alternative dimensions are specified in

procurement documents. Table 5.2 lists the acceptable tolerances.

TABLE 5.2

TOLERANCES FOR ASME AG-1, FILTER CASES

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

Face Dimensions less than 24 in. (610 mm)

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

Face Dimensions 24 in. (610 mm) and greater

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

Depth

/4 in. 1/16 in. (19 mm 1.6 mm)

Width of Gasket Surface

Squareness for Filter Face Dimensions

Face diagonals to be equal with the following

tolerance: + 1/8 in. (3 mm) total

+ 1/16 in. (1.6 mm) total allowance when

Gasket Sealing Surfaces - Flat and parallel

measured with one face of the filter resting on

a flat surface

Square with sides of case (within 3)

5.4.3.1

Wooden Cases: Case panels shall be joined with rabetted joints

which are assembled by gluing with an adhesive meeting the

requirements of Section 5.3.4 and assembled using fasteners that

comply with Section 5.4.3.3. The end points of the fasteners shall

not penetrate the inside or outside surfaces of the case. Faces,

edges, and inner surfaces of the case shall be thoroughly coated

with sealant to minimize permeability. Case face sealant shall not

reduce the ability of the gasket to adhere to the case. There shall

be no rough edges that might penetrate or cut workers' gloves or

injure the fingers of personnel handling the filters.