Type 1 Coil Cleaning:
Type 1 methods of coil reconditioning are appropriate for removing remove loose dust, dirt, or particulate from evaporator coil surfaces.  Physical removal of material is accomplished through a variety of methods:

• HEPA-filtered contact vacuuming of coil surfaces
• Use of crevice tools and contact vacuum bristle brushes that penetrate between coil fins
• Compressed air accelerator guns and wands that dislodge particulate

Type 2 Coil Cleaning:
If dust, dirt, or particulate is adhered to the evaporator coil surfaces and cannot be completely removed by Type 1 methods, Type 2 methods are used:

• Evaporator coils are removed and chemical coil cleaners are applied using electrical coil cleaning equipment
• Chemically cleaned coils are cleansed using pressurized water washing equipment or hot water and steam cleaning equipment
• HEPA-filtered wet contact vacuums or standard wet contact vacuums may be used outdoors to clean treated coils