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    Spun Aluminum Gravity Ventilator, Size 18

    Greenheck Product # GRS-18
    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.

    Product Variants

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    SKU BASE/PANEL LENGTH x WIDTH THROAT AREA INTAKE AREA PRICE
    Model / Size: GRS-18
    30 x 30 in 1.83 ft² 3.42 ft² $334.21