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Donaldson Company, Inc.
Designed for versatility, the WSO (Water, Smoke, and Oil) mist collector is specifically engineered for water-based, smoke, and
oil-based mist applications. WSO Mist Collector, Models WSO 25-4 and 25-6 collect airborne mist such as oil, water-soluble,
semi-synthetic and synthetic coolant from machining operations. Two stages of filtration, plus an optional HEPA or 95% DOP
filter, provide a cleaner, healthier work environment as well as a more cost effective means of mist collection. With nominal airflow
capacities of 7,400 cfm for WSO 25-4 and 11,100 cfm for the WSO 25-6, the WSO is a strategic component to meeting industrial
and government air-quality standards. The high efficiency filter cartridges allow air and coolants to be recycled.
Designed to increase the versatility of the collector, a variety of filter media specifically designed for mist collection is a standard
offering on the product line. The WSO 25-4 and 25-6 contain a 25 inch tall primary filter uniquely designed for either water-based
coolants, straight oils, or thermally-generated smoky applications. Standard options include drain collection containers, P-Traps,
and afterfilters.
WSO models 25-4 and 25-6 are available with or without a fan blower and motor.
Intended Use
Airborne mist is small droplets of metalworking fluids suspended in the air. Metalworking fluids include straight oils, water-soluble
coolants, semi-synthetic and synthetic coolants. These fluids perform a variety of functions such as lubricating or cooling the part
or the tool, flushing chips away from the part, and suppressing dust and smoke.
Mist is created two ways: mechanical action or thermal effects. Mechanical action involves coolant used for light lubrication and
generally creates mist greater than one micron in size. Thermal effects occur when heat vaporizes the coolant, the vapor cools
and recondenses into a mist. Thermal effects create mist from 0.01 to 1 micron in size. Other contaminants, such as dust from the
part or the tool or smoke from the vaporization of the oil or coolant are also generated when using metalworking fluids.
The WSO mist collector is not designed to handle water mist alone. There should be some type of oil content to allow coalescing
or water vapor will simply pass through the filters. The extremes of very heavy oil and light, thin oil should be avoided. Very heavy
oil, similar to tar consistency, will not drain while very light, thin oil, similar to paint thinner consistency, may evaporate.
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Product Description
Rating and Specification Information
General rating and specification information can be found in the product literature provided with the collector and is available on the
Donaldson website. For specific load values for a collector, see the Specification Control Drawing shipped with the collector.
