A ductless fume hood is a contained working space that uses powerful negative airflow to pull harmful fumes, vapors or particulate away from the operator’s respiratory zone and protects the operator and the environment from exposure.
How does a Ductless Fume Hood work?
![Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-02-Number1.jpg)
Ambient Air is drawn into the hood and mixed with fumes, vapors or particulates emitted from the process.
![Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-03-Number2.jpg)
The air within the hood is processed through a pre-filter where some particles are captured.
![Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-04-Number3.jpg)
Air is filtered through the main filter (HEPA, ULPA, ASHRAE, Activated Carbon or Specialty Blended).
![Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-05-Number4.jpg)
Filtered air is released back into the room eliminating the need for duct work.
Anatomy of a Ductless Fume Hood
Advantages of a Ductless Fume Hood
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Portable
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Long Filter Life
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Quiet Operation
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Sturdy Construction
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Low Maintenance
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Simple Filter Change
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
Variety of Sizes
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
No Ductwork
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-07-Checkmark.jpg)
No Makeup Air
Ductless Fume Hood Main Filter Choices
PARTICULATE FILTERS
ULPA Filter
![Ductless Fume Hood - ULPA filter efficiency](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-08-ULPAefficiency-300x276.jpg)
up to
99.9995%
Efficiency
![Ductless Fume Hood ULPA particle](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-09-ULPAparticle-300x154.jpg)
down to
0.12 microns
HEPA Filter
![Ductless Fume Hood - HEPA filter efficiency](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-10-HEPAefficiency-300x276.jpg)
up to
99.97%
Efficiency
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-11-HEPAparticle-300x154.jpg)
down to
0.3 microns
ASHRAE Filter
![Ductless Fume Hood ASHRAE efficiency](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-12-ASHRAEefficiency-300x275.jpg)
up to
95%
Efficiency
![Ductless Fume Hood ASHRAE particle](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-13-ASHRAEparticle-300x154.jpg)
down to
0.5 microns
CHEMICAL FILTERS
Activated Carbon
![](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-14-ActivatedCarbon-183x300.jpg)
Treated Carbon that has increased surface area in order to be more porous to adsorb chemical fumes.
Efficiency depends on chemical
Specialty Blended
![Acid Gas - Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-15-AcidGas-300x286.jpg)
Acid Gas
![Aldehyde - Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-17-Aldehyde-300x286.jpg)
Aldehyde
![Ammonia - Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-18-Ammonia-300x286.jpg)
Ammonia
![Mercury - Ductless Fume Hood](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-16-Mercury-300x286.jpg)
Mercury
Ductless Fume Hood Uses
![Ductless Fume Hood - 3D Printing](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-19-3DPrinting-300x278.jpg)
3D Printing
![Ductless Fume Hood Archaeology](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-20-Archaeology-300x278.jpg)
Archaeology
![Ductless Fume Hood Chemical Fumes](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-21-ChemicalFumes-300x278.jpg)
Chemical Fumes
![Ductless Fume Hood DNA](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-22-DNA-300x278.jpg)
DNA
![Ductless Fume Hood Forensic](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-23-Forensic-300x278.jpg)
Forensic
![Ductless Fume Hood Glasses Manufacturing](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-24-GlassesManufacturing-300x278.jpg)
Glasses Manufacturing
![Ductless Fume Hood Mycology](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-25-Mycology-300x278.jpg)
Mycology
![Ductless Fume Hood Paints Glues Solvents](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-26-PaintsGluesSolvents-300x278.jpg)
Paints, Glues, Solvents
![Ductless Fume Hood Pharmaceutical](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-27-Pharmaceutical-300x278.jpg)
Pharmaceutical
![Ductless Fume Hood Restoration of Art](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-28-artrestoration-300x278.jpg)
Restoration of Art
![Ductless Fume Hood Soldering](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-29-Soldering-300x278.jpg)
Soldering
![Ductless Fume Hood Stem Cells](https://www.sentryair.com/blog/wp-content/uploads/2018/08/DuctlessFumeHoodInfographic-30-stemcells-300x278.jpg)
Stem Cells
Other Biological Applications or Processes Requiring Dust Removal