UpCodes logo
Go To Full Code Chapter
Soil-depressurization system fans shall be designed to maintain the following minimum air-pressure differences at the lower opening of the radon vent pipe as compared to the air pressure of the conditioned space above:
  1. For systems using ventilation mats, 0.5 inch (0.52 kPa) water column.
  2. For systems using perforated pipe, 0.5 inch (0.52 kPa) water column.
  3. For systems using continuous gravel layers, 1.0 inch (0.2488 kPa) water column.
E403.6.1 Fan Sizing
Soil-depressurization systems that comply with the alternative compliance method, Section E403.2.2, and sizing, Section E403.5.2, may comply by sizing the fan as follows:
  1. For up to 100 lineal feet (30 480 mm) of ventilation mat the fan shall be rated for 50 cfm (24 L/s) at 1-inch (30 480 mm) water column.
  2. For 100 to 200 lineal feet (30 480 mm to 60 960 mm) of ventilation mat, the fan shall be rated for at least 100 cfm (30 480 mm) at 1-inch (30 480 mm) water column.
  3. For 200 to 400 lineal feet (60 960 mm to 121 920 mm) of ventilation mat, the fan shall be rated for at least 175 cfm (83 L/S) at 1-inch (0.2488 kPa) water column.

Related Code Sections

E402.4 Florida Standard for Radon-Resistant New Commercial Construction, Suction Fans
Suction fans create the critical pressure difference between the subslab and indoors. Suction fans shall be designed for continuous operation. Fan ...
E403.6 Florida Standard for Radon-Resistant New Commercial Construction, Suction Fans
Soil-depressurization system fans shall be designed to maintain the following minimum air-pressure differences at the lower opening of the radon vent ...