The transition boxes are constructed of black ABS with a haircel finish.  They are all 5" deep and at the opening are .25" larger than the nominal size.  The flange corners and all edges are rounded to avoid sharp points. We manufacture several models and sizes of grille transition boxes to fit those areas with limited space. Hose duct rings are available in 2" through 9" round and oval shapes.  The transition box is available in many sizes.  Choose your size in the box located above.

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