fan installation types
[EN 12792:2003, 159]:Type (A), free inlet, free outlet;Type (B), free inlet, ducted outlet;Type (C), ducted inlet, free outlet;Type (D), ducted inlet, ducted outlet(see also fan functions)
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fan outlet
[EN 12792:2003, 160]:opening usually circular or rectangular through which the air finally leaves the fan casing
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[EN 12792:2003, 161]:difference between stagnation pressure at the fan outlet and the stagnation pressure at the fan inlet
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[EN 12792:2003, 162]:section in which one or more fans are installed
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[EN 12792:2003, 163]:an pressure minus the fan dynamic pressure
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