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    Spun Aluminum Gravity Ventilator, Size 20

    Greenheck Product # GRS-20
    Model GRS is an aluminum ventilator designed to be used as an intake or relief unit on natural gravity or negative pressure systems. The GRS has a curb cap and requires a roof curb for installation.

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    SKUBASE/PANEL LENGTH x WIDTHTHROAT AREAINTAKE AREAPRICE
    Model / Size: GRS-20
    30 x 30 in2.25 ft²4.43 ft²$334.21
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