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property owner of any possible adverse effects. Articles or
materials that may be damaged should be subjected to an
alternate treatment if possible. Office furniture and equipment
with foam rubber can be affected and should be removed.
Computer equipment may have to be completely sealed with
polyethylene and a positive pressure maintained within the
sealed enclosure during the exposure period.
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Preparing to Fumigate
2-7-8 Treatment Manual 10/2002-04
PPQ
◆ Provide a sheltered area for taking gas concentration readings.
The area should be located a safe distance (30 feet or more) from
the enclosure. All gas sampling tubes and the electrical source
should be located within the sheltered area.
◆ Aeration of structure and commodities.
◆ Final release—This is the responsibility of the fumigator unless
the structure contains commodities requiring a Section 18
Exemption.
In addition to the above, explain to the fumigator that it is the
fumigator’s responsibility to perform the fumigation in a manner
which meets required treatment schedule, treatment procedures, and
pest safeguards prescribed by the PPQ officer. The fumigator is also
responsible for meeting all Federal, State, and local regulations. The
fumigator must notify local fire, police, and health officials as
required. The fumigator is also responsible for making arrangements
for utility services such as electricity, telephone, and water.
Your responsibility is to determine that the prescribed procedures are
followed, actually checking volume and dosage calculations, dosage
applications, and that the required gas concentrations are maintained.
When food commodities are involved, you must notify the local Food
and Drug Administration (FDA) office so they can collect residue
samples if they deem it necessary.
Step 4—Preparing Areas to Be Fumigated
In order to ensure uniform gas distribution and penetration, you may
require commodities within the structure to be restacked. Place dense
commodities such as flour and similar bagged commodities on pallets
or other supports to improve gas circulation.
In the outside surrounding area, rake the surface area of all debris by
raking the debris toward the structure.
Step 5—Arranging and Operating Fans
Use fans capable of 2,500 cfm or greater during gas introduction and
for 30 minutes following gas introduction. Extend fan operation only if
gas distribution is inadequate (concentration readings vary more than
4 oz.), or you need to add gas. If you must operate fans after the 30
minute reading, do so for the least amount of time required to get
equal gas distribution.
Placing fans is largely determined by the configuration of the structure
and the absence or presence of cargo, its nature, and quantity.
Pedestal fans are preferred for large structures. Direct fan air
movement upward to complement other fans and assure even gas
distribution in every area of the enclosure. There is no definitive rule
for determining the proper number of fans, but both you and the
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Preparing to Fumigate
10/2002-04 Treatment Manual 2-7-9
PPQ
commercial fumigator must be satisfied that circulation will be
adequate for both gas introduction and recirculation. Extremely tall
buildings may require fans at several levels to ensure gas distribution
to the top of the structure. Arrange the electrical source and extension
cords of the fan system so the fans can be turned on and off
individually from the outside of the enclosure.
Step 6—Placing Gas Sampling Tubes
Place gas sampling tubes in areas and commodities which will give
representative samples of the gas concentration within the fumigated
area. All gas sampling tubes must be 0.25 inch interior diameter
polyethylene tubing.
The recommended number of sampling tubes is as follows:
In addition to the number of sampling tubes described above, you
must place sampling tubes within commodities stored in the
structure. Place the sampling tube as near as practical to the center of
the packaging (example—boxes, bags, or bins). Before placing the
sampling tube in the commodity, wrap a piece of burlap over the end
of the sampling tube and secure the burlap to the tube with tape.
Use a minimum of three tubes for the first 10,000 ft3 of commodity.
Use additional tubes to assure sampling of all types of tightly packed
and difficult to penetrate commodities. Take care in placing sampling
tubes to avoid clogging or pinching. Label each sampling tube with the
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