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Build a small mushroom growing chamber with co2 control. Maintaining proper temperature and relative humidity is much easier when co2 control is added to the system. With Co2 control, a minimum of outside air is introduced into the chamber. Outside air is almost always too dry and too cold (or hot) and using more than necessary complicates temperature and humidity control. Agaricus-like species grow very well with co2 levels at 1,200-1,500 ppm co2 and AS310e can introduce just the right amount of fresh air to keep co2 levels in the optimum range. In this example, the chamber is constructed using sheets of polystyrene foam insulation, held together by packing tape. Tape every seam to make the box air tight. The top cover is held in place by a small weight of some kind. | ||
The amount of fresh air needed depends of the stage of development of the mushrooms. At pinning, and during peak of first flush, up to 10x more fresh air is needed to displace the co2 than is needed between flushes and during later flushes. Long stems and small caps are the result of trying to grow mushrooms when the co2 level is too high. Two tiny fans and AS310e are all you need. 
The fan capacity is not critical. The smaller the fan, the longer it will run each time fresh air is needed. But in addition to fresh air, continuous air circulation inside the chamber is very important, especially at high levels of humidity. Because, for the mushrooms to grow, evaporation of moisture from the surface of the mushrooms is necessary. Therefore, a separate fan system is needed to gently, but continuously, circulate the air inside the chamber. In this example, two additional fans are placed on the sidewalls of the chamber. Operating continuously, they move the air slowly in a circular pattern around the chamber. Make a smoke test to see the pattern of circulation. Blow a puff of smoke onto the casing soil inside the chmber and watch how it circulates. The smoke should drift at least one inch per second over the growing surface. Air velocities over 4-5 inches per second will lead to excessive drying. Too little air movement will favor development of bacterial blotch disease. With proper air flow, some water should be gently sprayed on the casing soil every 2-4 days to replace moisture that evaporates. 
In this example, heating and cooling are introduced into the chamber by using an acquarium pump and air stones to continuously bubble air through two water reservoirs. One reservoir has a 300 watt acquarium heater controlled by a thermostat. A copper evaporator coil from a small water cooler is submerged in the second reservoir and controlled by a cooling thermostat. 
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Return to Mushroom Climate's Site Index AS310e Standard Factory Model AS310e High Humidity Model How to use AS310e with a relay for co2 control DIY relay co2 controller for 1/3 hp fan, using off-the-shelf parts. How to Adjust AS310e's Analog Output Signal How to use AS310e to control a damper Fan speed control with AS310e's analog output 
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