Ductless fume hoods offer a budget-friendly alternative to traditional ducted systems while still providing essential protection in the lab. Unlike ducted units, which vent air directly outside via a centralized ducting system, ductless fume hoods rely on internal filtration to clean and recirculate air back into the room. While ducted systems excel in extraction performance and often support gas and water services, ductless options bring portability and ease of installation to the table.
If you're considering whether a ductless fume hood is right for your space, here's what you should know. These units typically feature a fan at the top that pulls air through a carbon filter—sometimes paired with a HEPA or ULPA filter—and then releases it back into the room. They come in compact sizes, such as 1200mm or 900mm wide, making them easy to move around if needed. Most models are equipped with a sash that adjusts automatically based on its height, ensuring consistent airflow.
Carbon filters are excellent at trapping volatile organic compounds (VOCs), but they aren't designed to handle inorganic substances like acids or bases. For example, chemicals such as hydrochloric acid, sulfuric acid, sodium hydroxide, potassium nitrate, ammonium nitrate, and phosphoric acid should never be used in a ductless fume hood due to their corrosive nature and potential to damage the carbon filter. Always consult the Safety Data Sheet (SDS) for each chemical to understand its risks and handling requirements.
On the flip side, ductless fume hoods work well for light chemical handling tasks or educational demonstrations where ventilation is beneficial but not critical. However, they fall short when it comes to tasks involving heat or high volumes of chemicals. Heating substances can degrade the effectiveness of carbon filters, and heavy-duty applications often require ducted systems capable of managing varying concentrations of fumes over extended periods.
For institutions or labs dealing with biohazards or requiring increased airflow, biosafety cabinets or ducted solutions are more appropriate. Additionally, if regulatory standards mandate external venting, ductless options won't meet those criteria either.
At Westlab, we pride ourselves on offering premium ductless fume cabinets tailored to fit your needs. Our Value-line and Pro-line models allow customization with various accessories and features. Plus, we stand behind our commitment to customer service by guaranteeing same-day dispatch for all orders placed before 2PM AEDT/AEST.
Ready to see one in action? Contact us today to schedule a demo at our Experience Centre! Please note that this article serves as guidance only and doesn't replace professional consultation. Ultimately, it’s up to the end user to choose the best equipment for their specific application.
*This piece is written from scratch and differs significantly from the original text.*
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