ACCESSORY KIT INSTALLATION MANUAL

4. Using sheet metal screws, attach the filter rack to thebottom of the furnace. It is recommended that weatherstrippingor sealant be used between the filter rack andthe furnace casing to reduce air leakage.5. For upflow platform return applications, cut the hole inthe platform the same size as the opening in the bottomof the filter frame. See Figure 2.6. For horizontal applications, attach the return air duct tothe bottom side of the filter rack. See Figure 3.7. For the 1BR01XX models, install the filter into the slot inthe filter rack.8. For the 1BR02XX models, install the filter provided intothe 2" slot in the inner side of the filter rack.9. For the 1BR02XX models, if a 1" filter is to be used, it willfit into the 1" wide slot provided.10. For the 1BR02XX models, if a 4 or 4-3/8" filter is to beused, remove the two internal removeable rails in the filterrack. These will slide out of the filter door, leaving aspace wide enough for a thicker filter.UFILTERRACKRETURN AIRPLATFORMFURNACEFIGURE 2: Bottom Return using Upflow PlatformRETURNDUCTSYSYTEMFIGURE 3: Bottom Return HorizontalSubject to change without notice. Printed in U.S.A.Copyright © by York International Corp. 2005. All rights reserved.171002-UAI-A-1205Supersedes: NothingUnitary 5005 NormanProduct York OKGroup Drive 73069