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fumigator.
Unless you authorize their use, do not allow motorized vehicles to
operate within the secure area.
Wearing Respiratory Protection
The fumigator and the PPQ officer monitoring the aeration must wear
approved respiratory protection (SCBA, air supplied respirator, or a
combination unit) when:
◆ Installing the exhaust system
◆ Opening the container for aeration
◆ Any time during the aeration process when a risk of exposure to
concentrations above 5 ppm exists. This includes any time the
concentration is unknown.
Aerating Nonsorptive, Containerized Cargo
Step 1—Installing Exhaust System
Advise the fumigator:
During the first 10 minutes of aeration, it is recommended that no people
should be within 200 feet of the exhaust duct outlet.1
1 If this buffer zone is regulated by the State or municipality where the fumigation takes place, local
regulations must be followed.
TABLE 2-8-9Determine the Aeration Procedure
If: And: And: Then:
Nonsorptive Containerized GO to page-2-4-32
Sorptive, including yams
and chestnuts
Containerized GO to page-2-4-33
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Aerating the Enclosure
2-8-26 Treatment Manual 10/2002-04
PPQ
◆ Install an exhaust fan (minimum of 5,200 cfm capacity) to a 16
inch, or greater, diameter duct located at the floor near rear
doors of the container.
◆ Or, as another option, install an air introduction duct system
consisting of a 3,750 cfm, or greater, fan attached to a 12 inch, or
larger, duct which reaches two-thirds of the length of the
container at the top of the load. Have the ducts installed prior to
the start of the fumigation. Extend the exhaust duct at least 30
feet beyond the container.
Step 2—Aerating the Commodity
Advise the fumigator:
1. Connect the exhaust duct to the exhaust fan.
2. Start the exhaust fan(s)
3. Aerate for 3 hours.
4. Stop the aeration fans.
5. Use a colorimetric tube to take a concentration reading in the
exhaust duct.
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.
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.
TABLE 2-8-10
If the gas concentration
level is: Then:
5 ppm or less RELEASE the commodity
6 ppm or more 1. CONTINUE aeration until the concentration is 5 ppm or less1, then
2. RELEASE the commodity
1 Concentration reading must be taken 4 feet from floor and 1 foot inside stack at two locations
between the cartons but not inside the cartons.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Aerating the Enclosure
10/2002-04 Treatment Manual 2-8-27
PPQ
Aerating Sorptive Commodities in Containers
Step 1—Installing the Exhaust System
Advise the fumigator:
◆ Install an exhaust fan (minimum of 5,200 cfm capacity) to a 16
inch or greater diameter duct located at the floor near rear doors
or the container.
◆ Or, as another option, install an air introduction duct system
consisting of a 3,750 cfm or greater fan attached to a 12 inch or
greater duct which reaches two-thirds of the length of the
container at the top of the load. Have the ducts installed prior to
the start of the fumigation. For outdoor fumigations, extend the
exhaust duct 30 feet beyond the container.
Step 2—Aerating the Commodity
Outdoors
Advise the fumigator:
1. Complete installation of exhaust duct and begin exhaust fan.
2. Start the circulation and air introduction fans. Sorptive
commodities generally require 12 hours or longer to aerate. Since
sorptive commodities vary in their rates of desorption, aeration
may be completed in less than 12 hours. Require a minimum of 4
hours aeration for all sorptive commodities.
3. Stop the circulation fans and take concentration readings with
　
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