Why pre-ventilate?

Natural emissions, fumigation and damaged goods.

Harmful chemicals can have accumulated from the natural emissions given off from the goods and packing material. Neurotoxic chemicals such as phosphine or sulphuryl fluoride may have been deliberately added for fumigation purposes. Signage or documentation of fumigation is often missing. Damaged goods can be another source of harmful emissions. Seemingly harmless goods may still emit harmful substances, such as formaldehyde, as part of natural processes or lingering emissions from the production.

No warning properties

Accumulation of gases inside the poorly ventilated containers may reach toxic levels. Many harmful volatile chemicals have no warning properties, like odor, or may be masked by other scents. In most cases, measurements with advanced instrumentation is the only way to identify and establish the identity and correct levels.

Not sure if safe? Pre-ventilate

Unless a container has been determined to be safe, that is having levels at or below established 8-hour occupational exposure limits, we recommend pre-ventilation before opening and entering. Our method of pre-ventilation lowers the arrival concentrations in most cases to 10% or less, within four hours, often faster.

Pre-ventilation using our method is done before the container doors are opened. This eliminates the risk of exposure to high concentrations when the doors are opened for installation of other types of ventilation equipment. The only time the container doors needs to be temporarily opened is when the corner vents have been taped from the inside. This situation is easily determined noting the lack of exhaust air from the turbine or by vacuum measurement in a vacuum port in the Evaqplate. The tape from the nearest vent is removed (if possible), the door closed and the Evaqplate attached to this cleared vent. Taping of vents from the inside should be discouraged and communicated upstream to the parties stuffing the container.

Consider the fast reaccumulation

Due to on-going emissions, reaccumulation is often rapid in ventilated containers. Pre-ventilation should be carried out immediately before the container is opened and can also be left running while working inside.

Not sure if safe? Pre-ventilate

Unless a container has been determined to be safe, that is having levels at or below established 8-hour occupational exposure limits, we recommend pre-ventilation before opening and entering. Our method of pre-ventilation lowers the arrival concentrations in most cases to 10% or less, within four hours, often faster.

Pre-ventilation using our method is done before the container doors are opened. This eliminates the risk of exposure to high concentrations when the doors are opened for installation of other types of ventilation equipment. The only time the container doors needs to be temporarily opened is when the corner vents have been taped from the inside. This situation is easily determined by noting the lack of exhuast air from the turbine or by vacuum measurement in the vacuum port in the Evaqplate. The tape from the nearest vent is removed (if possible), the door closed and the Evaqplate attached to this cleared vent. Taping of vents from the inside should be discouraged and communicated upstream to the parties stuffing the container.

Consider the fast reaccumulation

Due to on-going emissions, reaccumulation is often rapid in ventilated containers. Pre-ventilation should be carried out immediately before the container is opened and can also be left running while working inside.

Evaqvent AB, Sweden

Pre-ventilation of shipping containers made easy
info@evaqvent.com

Evaqvent AB, Sweden

Pre-ventilation of shipping containers made easy
info@evaqvent.com