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Fantech FPS10 Positive/Negative Pressure Switch Kit Installation Instructions
The FPS10 is a very versatile switch. The pressures are relative to the two taps on the switch. When they are both open (as shipped), the pressure at both points is equal, the internal SPDT switch wil
Building Tightness Limits
  Building Tightness Limits (BTL) can provide a guideline for tightening up a house. (Parts of this are excerpted from The Residential Ventilation Handbook by Paul H. Raymer published by M