SSD Systems

As previously mentioned, the air pressure in most homes is less than the air pressure in the surrounding soil. The difference in air pressure is what draws radon into the home. An SSD system alters the pressure beneath the concrete slab, making the subslab pressure less than the indoor pressure. It is the altered air pressures that keep radon from entering the home.

Figure 31.12 shows the theory of operation, a simple system layout, and the components of an SSD system.

Careful attention to details when in the design stage of an SSD system will help ensure the easy installation of a system if it is found to be required. The proper details are given in the following subsections, beginning at the subslab area and progressing upward to the exhaust.

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DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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