CoolMistHumidifier.com

HVAC-Filters.org
Offers indoor air quality filters and related products.
www.hvac-filters.org/

Headline Filters
Micro-fiber, PTFE, and stainless steel filter elements and housings.
www.headlinefilters.com/

Emcel Filters Limited
Specializes in the design and manufacture of a wide variety of filters for air and gas purification applications ranging from simple air conditioning to complex chemical systems.
www.emcelfilters.co.uk/

Superflo Filters Private Limited
Engineering and supply of industrial filters, and equipment.
www.superflo-filters.com/

Magnum Filters Ltd.
New Zealand based manufacturers of a wide selection of filter cartridges for drinking water, spa, and swimming pool requirements. Site includes cleaning and maintenance suggestions.
www.magnumfilters.com/

Russian Water Filters
Aquaphor is a Russian manufacturer of water filter devices with US distribution.
www.aquaphor.com/

The HVAC Tool Box
Tools and basic information for engineering HVAC systems. Includes dimensions, materials, standards and system configurations.
www.hvac-toolbox.com/

Dayton Reliable Filters
Quality air filtration supplies for commercial, industrial and residential solutions.
reliablefilter.com/

Buy-Filters.com
Dust collector parts and filters.
www.buy-filters.com/

HowStuffWorks: Charcoal Filters
What is activated charcoal and why is it used in filters?
www.howstuffworks.com/