Ducts through the walls must be insulated and all joints taped or sealed to prevent air or moisture from entering the wall cavity.
CAUTION
Some installations may not require any return air duct. A metallic return air grille is required with installations not requiring a return air duct. The spacing between louvers on the grille shall not be larger than 5/8 inches.
Any grille that meets the 5/8 inch louver criteria may be used. It is recommended that Bard Return Air Grille Kit RG2 thru RG5 or RFG2 thru RFG5 be installed when no return duct is used. Contact distributor or factory for ordering information. If using a return air filter grille, filters must be of sufficient size to allow a maximum velocity of 400 fpm.
NOTE: If no return air duct is used, applicable installation codes may limit this cabinet to installation only in a single story structure.
FILTERS
A 1 inch throwaway filter is supplied with each unit. The filter slides into position making it easy to service. This filter can be serviced from the outside by removing the service door. A 1 inch washable filter and a 2 inch pleated filter are also available as optional accessories. The internal filter brackets are adjustable to accommodate the 2 inch filter by loosening two (2) screws in each bracket assembly and sliding the brackets apart to the required width and retightening the four (4) screws.
FRESH AIR INTAKE
All units are built with fresh air inlet slots punched in the service panel.
If the unit is equipped with a fresh air damper assembly, the assembly is shipped already attached to the unit. The damper blade is locked in the closed position. To allow the damper to operate, the maximum and minimum blade position stops must be installed. See Figure 2.
All capacity, efficiency, and cost of operation information as required for Department of Energy “Energyguide” Fact Sheets is based upon the fresh air
The
FIGURE 2
FRESH AIR DAMPER ASSEMBLY
BLADE IS LOCKED
CLOSED 
FOR
SHIPPING
CONDENSATE DRAIN
A plastic drain hose extends from the drain pan at the top of the unit down to the unit base. There are openings in the unit base for the drain hose to pass through. In the event the drain hose is connected to a drain system of some type, it must be an open or vented type system to assure proper drainage.
Manual
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