In common usage, a collection is any group of items that has one or more properties in common, usually brought together for some specific purpose. See Collecting and Collectibles.
The term can also be used more specifically:

ACS Air Cleaning Systems - Supplier of industrial air filters to remove oil mist, dust, and smoke.
Meta Description: [ Cleaner air from Air Cleaning Systems. Industrial air filters to take away oil mist, dust, smoke and pollutants from your factory area. Fast efficient and cost effective service. ]
AerPro Industrial Air Filtration Systems - Supplier of self contained industrial dust and oil mist collectors.
Meta Description: [ Gulftech Sales Solutions for Manufacturing, High Quality and Environmental and Production Machinery ]
Air Filtration Systems - Distributor of air filtration products.
Meta Description: [ In addition to our standard domestic FREE FREIGHT POLICY, Air-Filtration Systems offers discount pricing (40%-75%) on Replacement Cartridge Filters, Pleated Bag Filters, HEPA Filters and Fabric Filters which are used in Dust Collection, Dry Process Filtration and Pollution Control Systems.
With ... ]
Air Purifiers Inc. - Supplies air cleaners, dust collectors, source capture ventilation for industry.
Airflow Systems, Inc - Manufactures industrial and commercial dust, smoke, mist, and fume collectors.
Meta Description: [ Airflow Systems, Inc. produces clean air equipment systems that protect workers, the environment, costly equipment, and production time. ]
BWF America - Manufactures dust collector bags, liquid filter cloths, and filtration media.
Meta Description: [ BWF America is a high quality, technically orientated manufacturer of standard and specialty felt dust collector bags, liquid filter cloths, cages and accessories backed up by full service baghouse maintenance and repair team. ]
CECO Environmental Corp. - Manufactures and sells industrial air filters used to trap, collect and remove solid soluble and liquid particulate matter suspended in air or other gas streams. Offers complete operation, maintenance and data processing services to industrial and commercial customers. (Nasdaq: CECE).
Filtermist - Manufacturer of oil mist filters.
Meta Description: [ Filtermist manufactures oil mist filters for extraction and elimination of oil mist in industrial applications, allowing you to keep within health and safety regulations, and more importantly, maintain a clean and healthy working environment. ]
Flanders Corporation - Designs, manufactures and markets precision high-performance air filtration products and related equipment and hardware. (Nasdaq: FLDR).
Industry Air Sales - Supplier of dust collectors and filters.
Meta Description: [ Air Filtration Ontario, Hepa, Wet, Oil, Mist, Collection, Filters ]
JB Thorne - Designs, manufactures, and installs a wide range of dust and air pollution control equipment to meet health and safety requirements.
Meta Description: [ JB Thorne - Leicester UK dust fume extraction design application manufacture to industry solutions for occupational hygiene ventilation environmental and health and safety ]
Klimawent USA - Supplier of dust collection, fume extraction, air cleaning and pollution control equipment.
Meta Description: [ KLIMAWENT USA, LLC is a supplier of dust
collectors and fume extraction equipment in welding, vehicle
and other industrial fume or dust extraction processes. ]
Quality Air Management - Supplier of dust, mist and smoke collectors.
Meta Description: [ Most Advanced Technology baghouse and cartridge style dust collectors, in-line spark arrester, indoor air quality solutions, consulting and retrofits. ]
Replace Air - Manufacturer of air cleaning equipment to capture dust, mist, smoke, and fumes.
Meta Description: [ Industrial air & water pollution control & sheet metal fabrication. ]
Ryvac Engineering Company - Manufacturer of dust collection systems, industrial vacuums, fume and dust arms, central vacuum systems, and filters.
Meta Description: [ Dust Collection, Industrial Air Cleaning Equipment and Collector Systems ]
Sternvent Industrial Dust Collectors - Manufacturer of dust control equipment including bag houses, jet pulse, mist arresters, and cyclones.
Meta Description: [ Solve your Dust Control Problems with Sternvent Industrial Dust Collectors ]
U.S. Air Filtration - Manufacturer of dust collector, baghouse systems, and filters.
Meta Description: [ Dust collector and baghouse manufacturer of engineered dust collection systems turnkey installed.Pulse Jet Baghouses and Cartridge Dust Collectors are state of the art air filtration systems for meeting air pollution requirements. ]
U.S. Body Products - Supplier of filters and air cleaners for industrial applications.
Meta Description: [ U.S. Body Products offers a wide variety of workshop air cleaners and dust collectors designed for heavy duty use in workshops, welding shops, and body shops. ]
Ultra Industries, Inc. - Manufactures pollution control, dust Collection, and pneumatic conveying equipment.
Meta Description: [ Ultra Industries Inc. is a manufacturer of pollution control, Dust Collection and pneumatic conveying equipment. We manufacture Dust Collectors Dust Collector Baghouses Bag House Binvents Cartridge Collectors Cyclones Filter receivers and any related ductwork and auxilliary equipment. ]
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