As indicated by its name, “source-capture” fume extractors capture hazardous airborne particulate and fumes at the source of emission, as opposed to systems that are designed to purify general room air.
In the example below, a source-capture Welding Fume Extractor is being utilized to capture hazardous airborne by-product of the welding operation being performed. The source-capture hood of this portable unit is situated in very close proximity to the source of emission in order to capture the highest volume of airborne contaminants before they are able to reach the respiratory zone of the operator.
|Sentry Air’s Model 300 Welding Fume Extractor pictured above|
The picture above is also an example of a purifying and recirculating source-capture fume extractor. After fumes and particulate are captured, they are directed through the fire-retardant flex arm and into the filtration system. The filtration system for this particular unit typically consists of a pre-filter and main filter [HEPA Filter- up to 99.97% efficient on particles 0.3 microns and larger]. Other source-capture models may vent outside.
Source-capture fume extractors are commonly equipped with one or multiple extraction arms. The material, length, and flexibility of these arms can vary depending on the manufacturer.
|Sentry Air Model 100 ESD-Safe Solder Fume Extractor with Anti-Static Flex Hose
(used primarily for solder fume extraction)
|Sentry Air Model 500 Heavy-Duty Fume Extractor with
11′ articulated extraction arm
Hooded enclosures, such as Ductless Fume Hoods, can also be considered source-capture fume extraction systems because they are designed to contain and extract airborne particulate and fumes to prevent them from being released into the immediate environment or operator’s breathing zone.
|Sentry Air’s 40″ Wide Ductless Fume Hood pictured above
for acetone fume control while cleaning parts
General room (or ambient) air cleaners are designed to lower overall particulate or odor levels in a room or enclosed space. These air purification systems can range from small units (for small rooms or offices) to large systems (for warehouses, restaurants, workshops).
|Sentry Air’s Model 200 Portable Room Air Cleaner|
|Sentry Air’s Model 2000 Free-Hanging Industrial Air Cleaner|
“Local exhaust ventilation when used as described in (a) shall be designed to prevent dispersion into the air of dusts, fumes, mists, vapors, and gases in concentrations causing harmful exposure. Such exhaust systems shall be so designed that dusts, fumes, mists, vapors, or gases are not drawn through the work area of employees.” [osha.gov]