Cascade Sciences CVO-5-EX Series, Installation & Operation Manual, Page: 46 / 132

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INSTALLATION
V
ENTILATION
A
SSESSMENT
R
EQUIRED
The ventilation system for the hazardous location the oven will be installed in must prevent buildups of
potentially explosive gas or vapor mixtures in the air. Conditions under which this could occur include:
• Excessive amounts of solvents or other hazardous materials evaporating from samples
while being loaded into the oven chamber.
• Residual hazardous materials outgassing from treated product or samples while being
unloaded from the oven after processing.
•
Explosive concentrations arising from spilled hazardous materials.
•
Contents evaporating from hazardous materials containers accidentally left open.
Determining Sufficient Ventilation
This determination must be based on an evaluation of your site with its airflow and HVAC
characteristics, the specifics of your baking application and the hazardous materials involved. The
HVAC or other climate control system should meet all applicable hazardous location requirements
for the safety jurisdiction you are located in.
General considerations:
•
Consult with your fire or other safety jurisdiction officials to verify the applicable ventilation
requirements and the local interpretations of those requirements.
•
The airflow or active ventilation provided at the front of the oven must be sufficient to
prevent the buildup of explosive gas or vapor concentration from samples, products, or
solvents being handled by the oven operators and other process technicians.
Neutral Gas Ventilation
• If you are using gas nitrogen (GN
RR
2
RR
) for purging and pressurizing the oven safety
enclosures or for backfilling, ensure there is sufficient ventilation in the workspace area to
prevent asphyxiation or hypoxia conditions.
• The ventilation must be sufficient to protect employees in the event of a leak in the GN
RR
2
supply system.
• The workspace ventilation system must provide a minimum of
6 air changes per
minute.