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The heating and ventilation systems in a poultry house must be continuously monitored to keep the moisture content of the litter controlled so that the litter remains friable (easily broken up or crumbly). If the litter becomes too wet and the litter is allowed to become "sealed", then the birds will be living on a damp, slippery and sticky ...
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The vent can also provide air to fill any vacuum created. The key to a functional island fixture vent is that the top elbow must be at least as high as the "flood level" (the peak possible drain water level in the sink), allowing it to serve as a de facto vacuum breaker preventing the loop from becoming a siphon for an overfilled sink, as from ...