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- Unit casing material type and or thickness
- AgIONTM antimicrobial coated internal surfaces
- Aluminum checker plate floor
- Access doors and access panels on both sides of the unit sections
- Glass inspection windows in access doors
- Marine lights pre-wired to wall switches
- Factory installation of damper actuators
- Factory installation of special equipment
- Insulated damper blades
- Polyurethane finish on external surfaces
- Air leakage test with written report

- Additional drain connections in most sections
-  Built-in structure to support stacked units

- Special configuration
 Electrical power package

- Control package

- Special corrosion resistant coatings on internal and/or external surfaces
Fans
- Heavy-duty split housed bearings with minimum average life (L-50) of 200,000 hours

- Belt guards

- Inlet and outlet screens

- Protective enclosures for plenum fans

- Special coatings

- Special motors: TEFC, high efficiency, 2-speed, etc.

- Inertia bases

- Extended lube lines to lubricate both bearings from one side of the unit casing exterior

- Seismic isolators
Coils
- Fin, tube and coil casing materials

- Fin thickness

- Tube wall thickness

- Special corrosion resistant coatings

- Piping connection material