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Duct registers, grilles and diffusers shall be installed in accordance with the manufacturer's instructions. Volume dampers or other means of supply air adjustment shall be provided in the branch ducts or at each individual duct register, grille or diffuser. Each volume damper or other means of supply air adjustment used in balancing shall be provided with access.
603.18.1 Floor Registers
Floor registers shall resist, without structural failure, a 200-pound (90.8 kg) concentrated load on a 2-inch-diameter (51 mm) disc applied to the most critical area of the exposed face.
603.18.2 Prohibited Locations
Diffusers, registers and grilles shall be prohibited in the floor or its upward extension within toilet and bathing rooms required by the International Building Code to have smooth, hard, nonabsorbent surfaces.
Exception: Dwelling units.

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603.18 Duct Systems, Registers, Grilles and Diffusers
Duct registers, grilles and diffusers shall be installed in accordance with the manufacturer's instructions. Volume dampers or other means of supply ...
603.18 Duct Systems, Registers, Grilles and Diffusers
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Diffusers, registers and grilles shall be prohibited in the floor or its upward extension within toilet and bathing rooms required ...
Section 603 Duct Systems, Duct Construction and Installation
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