In plate-and-frame filter presses used in chemical/process engineering, the frame thickness is normally within the following range (inches):

Introduction / Context:
Plate-and-frame filter presses are widely used for slurry dewatering in pharmaceuticals, food processing, minerals, and fine chemicals. A critical geometric parameter is the frame thickness, which sets the cake chamber depth and directly impacts cycle time, cake volume, and filtration performance.

Given Data / Assumptions:

• Conventional plate-and-frame press operating under moderate pressures.
• Standard industrial practice ranges are being referenced (not special high-thickness custom frames).
• Units required in inches.

Concept / Approach:
Typical commercial ranges for frame thickness are about 1.5–4 inches for general-purpose operations. Thinner frames yield thin cakes and more frequent cycles; thicker frames are used for slurries that form porous cakes or when higher solids per cycle are desired.

Step-by-Step Solution:
Identify the typical industry range for frame thickness.Common literature and vendor data place this near 1.5–4 inches.Match to the closest option provided.Option “1.5 to 4” exactly matches the standard range.

Verification / Alternative check:
Look at catalog specifications of mainstream OEMs: standard frames cluster around 38–100 mm (≈1.5–4 in), confirming the selection.

Why Other Options Are Wrong:

• 0.25 to 4: Lower bound too small for practical chambers.
• 0.25 to 8: Both bounds unrealistic for typical general-duty presses.
• 1 to 5: Plausible but broader than standard; upper bound often not “normal.”
• 1 to 12: Much too broad; 12 in is atypical for standard frames.

Common Pitfalls:
Confusing plate thickness with frame thickness; assuming extremely thick frames are “normal” rather than special-purpose designs.

Final Answer:
1.5 to 4