The Z-pattern created by the baffles reduces air flow slightly. Both models will accommodate wall thicknesses from 3.5 in. Zenon has two metal sleeves that slide into the wall from opposite sides. Metal grilles mount to flanges on the sleeves. Tests showed a sound level of 46 dBa for the Zenon and 61 dBa for an unrestricted opening, which is a significant reduction.
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