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Hello, For a Vertical Internal Blower - 7” Round or 3-1/4” x 10”. for a Horizontal Internal Blower - 3-1/4” x 10”. Thank you for your inquiry! - Zephyr
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Hello, For a Vertical Internal Blower - 7” Round or 3-1/4” x 10”. for a Horizontal Internal Blower - 3-1/4” x 10”. Thank you for your inquiry! - Zephyr