This is a 90-degree ceiling box — meaning a box used in an HVAC duct or ceiling system that turns airflow (or transitions) through a right angle (90°).

PACE Supply

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PIM Media

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Model 59F6128 is from the 59F series (“Ceiling Box w/ Flange”) by Southwark Metal Manufacturing.

PACE Supply

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Size is 6 in × 12 in × 8 in. The “6x12” refers to the rectangular cross-section of the duct opening, and the “8” refers to the nominal pipe/connection size (round or equivalent), or throat diameter of the connection.

PACE Supply

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Ecmdi

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It includes a flange for mounting/register or grille installation. The flange gives an edge to screw or otherwise fasten the face plate or grille to the ceiling.

PACE Supply

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Ecmdi

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Material: galvanized steel. The finish is typically hot-dipped galvanized for corrosion resistance.