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exhaust duct.
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 Nonsorptive, Noncontainerized Cargo—Indoors and Outdoors
03/2004-05 Treatment Manual 2-4-33
PPQ
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 Nonsorptive, 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). An exhaust duct is optional for
outdoor fumigations.
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.
Step 2—Aerating the Commodity
Advise the fumigator to:
1. Start the exhaust fan.
TABLE 2-4-10: 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 until the concentration is 5 ppm or less1,
then
2. RELEASE the commodity
1 Take concentration readings with colormetric tubes 4 feet from the base of the stack and 1 foot
inside the stack at two locations between the cartons, but not inside the cartons.
Important
This step is optional for outdoor fumigations, but must be done for indoor
fumigations.
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 Nonsorptive, Noncontainerized Cargo—Indoors and Outdoors
2-4-34 Treatment Manual 03/2004-05
PPQ
2. Lift the end of the tarpaulin opposite the end with the exhaust
fan and duct (if used).
3. Aerate the enclosure for 2 hours.
Outdoor
Fumigations
Advise the fumigator to:
1. Stop the fans.
2. Remove the tarpaulin.
3. Take concentration readings with colormetric tubes 4 feet form
the base of the stack and 1 foot inside the stack at two locations
between the cartons, but not inside the cartons.
After the fumigator takes the concentration reading, you must then
record the date, concentration reading, and time in Block 39 of PPQ
Form 429. If you are not at the fumigation site, have the fumigator call
and give you the information. Then use the following table to
determine when to release the commodity.
Indoor
Fumigations
Advise the fumigator to:
1. Stop the fans.
2. Take concentration readings with colorimetric tubes 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.
TABLE 2-4-11: Determine When to Release the Commodity for Outdoor Fumigations
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 5 ppm or less, then
2. RELEASE the commodity
TABLE 2-4-12: Determine When to Release the Commodity for Indoor Fumigations
If the gas
concentration
level is: Then:
5 ppm or less 1. ADVISE fumigator to REMOVE the tarpaulin, and
　
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