Negative Pressure Ventilation – Inlet machines

The number, as well as size, of air inlets recommended for negative pressure houses has steadily increased over the years. Ten years ago, a 400' house may have had only ten or twenty 4" X 4' inlets (13 ft2), if any at all. Today, many new houses have over fifty 7" X 4' inlets (140 ft2). The dramatic increase in inlet area has given producers a higher level of control over house temperature, air quality, and fuel usage. The more control a grower has over these factors, the more control he has ove...r his paycheck.

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Year Volume Number Categories
1992 5 1