Add 37 mm to the duct dimension for the overall frame dimension.

Example: The 125 x 125 duct is a 162 mm x 162 mm frame * Egg Crate Grill * for air extraction where up to 90% free space is required.

32 mm flanged aluminum egg crate core drilled for screw fixation 12 x 12 mm picture frame finish fully welded and polished to conceal corners Extruded aluminum frame silver stove enamel or white finish

RS PRO 銀色鋁質格柵，125 x 125mm 432-693 432-693

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