Reserved dimensions for the grille distribution box
When ordering plenum boxes please specify length, width & height, spigot size and position (Top or Side Entry) and control options. Correct selection and sizing of distribution plenum boxes is critical because grille air resistance is very low relative to the distribution ductwork resistance. Available with Side or Top Entry connections to customer-specific diameter/shape, these can be fitted with Spigot flap dampers GPB, cord- or quadrant-operated, as well as 6mm acoustic. Please use this product if you want to define the dimensions of a rectangular or bespoke grille or plenum box to your exact requirements.
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