ILLINOIS REGISTER 6825
ILLINOIS EMERGENCY MANAGEMENT AGENCY
NOTICE OF PROPOSED AMENDMENTS
operated during closed-building conditions.
iv) All windows shall be kept closed.
v) All external doors shall be closed except for normal entry
and exit. Structural openings due to disrepair or structural
defects shall be repaired to correct their condition prior to
initiation of closed-building conditions. All exterior
windows and doors shall be inspected by a Radon
Measurement Professional licensee or Radon Measurement
Technician at the placement and retrieval of the detectors
and the result of the inspection documented for the
vi) Whole-house fans shall not be operated. Portable window
fans shall be removed from the window or sealed in place.
Window air conditioning units shall only be operated in a
recirculating mode. If the building contains an air handling
system, the air handling system shall not be set for
continuous operation unless the air handling equipment is
specifically used for radon control and is so labeled.
vii) Fireplaces or combustion appliances, except water heaters
and cooking appliances, shall not be operated unless they
are the primary sources of heat for the building.
viii) Ceiling fans, portable dehumidifiers, portable humidifiers,
portable air filters and window air conditioners shall not be
operated within 20 feet of the detector.
D) Short-term measurements of less than 96 hours shall not be
conducted during severe storms or periods of sustained high winds
(30 miles per hour or more). Radon Measurement licensees shall
check and document local weather forecasts prior to placing short-term
measurement devices when the measurement period is less
than 96 hours.
AGENCY NOTE: The National Weather Service defines a severe
storm as a storm that generates winds of 58 mph and/or ¾-inch
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