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2. RELEASE the commodity
6 ppm to 99 ppm 1. ADVISE fumigator to REMOVE the tarpaulin, and
2. CONTINUE aeration until the concentration is 5 ppm or less, then
3. RELEASE the commodity
100 ppm or above 1. CONTINUE aeration and take concentration readings until the
concentration level is below 100 ppm, then remove the tarpaulin, and
2. CONTINUE aeration until concentration is 5 ppm or less, then
3. RELEASE the commodity
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aeration Procedures for Fresh Fruits, Vegetables, and Cut Flowers—Indoors or Outdoors
03/2004-05 Treatment Manual 2-4-35
PPQ
Aeration Procedures for Fresh Fruits, Vegetables, and Cut Flowers—Indoors
or Outdoors
Step 1—Installing Exhaust System
Use the following table to determine which size fan to use.
An alternate procedure to using exhaust fans and ducts is to aerate
through a vertical stack.
Step 2—Aerating the Commodity
Advise the fumigator to:
Important
Do not use these procedures for fresh chestnuts or yams. (See procedures for
sorptive commodities on page-2-4-38)
TABLE 2-4-13: Determine Number of Fans
If the enclosure is: Then:
Evenly stacked up to 25,000
ft3
USE two 5,000 cfm fans connected to 3 foot diameter
exhaust ducts
Irregularly stacked of any size USE three 5,000 cfm fans connected to 3 foot diameter
exhaust ducts
More than 25,000 ft3 CONTACT the Center for Plant Health Science & Technology
(CPHST) in Raleigh, North Carolina.
Up to 1000 cu ft USE one fan, 67-350 cfm
1001-15,000 cu ft USE one or 2 fans. The volume of the enclosure divided by
the sum of the cfm of the fans should equal a figure of 15
or less. Connect fan(s) to 3-ft diameter exhaust duct(s) 3 ft
in diameter.
15,001-25,000 cu ft USE two fans, each 1,000 to 5,000 cfm. The volume of
the enclosure divided by the sum of the cfm of the fans
should equal a figure of 15 or less. Connect fan(s) to
exhaust duct(s) 3 ft in diameter.
More than 25,000 cu ft CONTACT the Center for Plant Health Science and
Technology (CPHST) in Raleigh, North Carolina, for advice
prior to conducting the first fumigation.
Important
(1) Volume of enclosure (in cubic feet) divided by the sum of cubic feet per
minute (cfm) of the exhaust fan(s) or exhaust blower equals the number of
minutes required per complete gas volume exchange. (2) Sixty minutes divided
by the number of minutes per gas volume exchange equals the number of
complete gas exchanges per hour. The result should be in the range of 4 to
15. The faster the rate of aeration the better, particularly for perishable
commodities. If the exhaust flow is•connected to a methyl bromide recovery
system, this device must not impede the flow rate to less than 4 volumes per
hour.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Aerating Sorptive, Noncontainerized Cargo—Indoors and Outdoors
2-4-36 Treatment Manual 03/2004-05
PPQ
1. Connect the exhaust duct to the exhaust fan.
2. Start the exhaust fan(s) and lift the end of the tarpaulin opposite
the end at which the exhaust fan and duct are located.
3. Aerate for 2 hours.
4. Remove the tarpaulin and allow 2 hours for passive aeration.
5. Take a final reading.
After the fumigator takes the concentration reading, you must record
the date, concentration reading, and time in Block 39 of PPQ Form
429. Then use the following table to determine when to release the
commodity.
Aerating Sorptive, Noncontainerized Cargo—Indoors and Outdoors
Step 1—Installing the Exhaust System
Advise the fumigator to:
1. Install an exhaust duct (minimally one 3,500 cfm capacity fan
connected to an exhaust duct).
2. Extend the exhaust duct outlet to an outside area where there is
adequate ventilation and at least 30 feet away from the building
or through a vertical exhaust stack extending through the roof.
TABLE 2-4-14: Determine When to Release the Commodity
If the gas concentration level
is: Then:
5 ppm or less RELEASE the commodity
6 ppm or more 1. CONTINUE aeration and take concentration readings
until the level is 5ppm or less, then
2. RELEASE the commodity
Important
Give the original and one copy to your supervisor for review. The supervisor
should keep the original for port files and send one copy to:
USDA, APHIS, PPQ, CPHST
Treatment Support & Certification
1017 Main Campus Drive, Suite 2500
Raleigh, NC 27606
Important
This step is optional for outdoor fumigations, but must be done for indoor
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