City Series CB72EPV | 65installation919-754 05.12.171TOP VENT REDUCER INSTALLATION—FROM 5" X 8" TO 4' X 6-5/8"TOP VENT REDUCER INSTALLATION—FROM 5" X 8" TO 4' X 6-5/8"tooltiptooltip1. Apply a bead of Millpack around the base of the inner vent collar. Slide theinner adapter over the collar and secure with 3 screws.3. Follow installation instructions for the Flex venting kit.2. Apply a bead of Millpack around the base of the outer vent collar. Slide theouter adapter over the collar and secure with 3 screws.Inner adaptor Outer adaptorInner collar Outer collarMillpack MillpackB36XTE/B36XTCEB36XTE/B36XTCEtooltiptooltip1. Apply a bead of Millpack around the base of the inner vent collar. Slide theinner adapter over the collar and secure with 3 screws.3. Follow installation instructions for the Flex venting kit.2. Apply a bead of Millpack around the base of the outer vent collar. Slide theouter adapter over the collar and secure with 3 screws.Inner adaptor Outer adaptorInner collarOuter collarMillpackMillpackTop Vent Reducer Installation — from 5" x 8" to 4" x 6-5/8"Ceiling Firestop / Firestop Spacer919-698 06.12.1860-1/4Ceiling firestopDiagram 1Diagram 1aEnclosureCeiling firestopFlashingTermination CapStorm CollarRoof supportCeiling firestopFirestop spacer to preventdebris from falling into the ceilingfirestopA ceiling firestop/firestop spacer must be installed when passing througheach floor or ceiling level. To install the ceiling firestop/firestop spacer ina flat ceiling or floor joist cut a 10- ¼ inch square hole. Frame the hole asshow in Diagram 1 and install the ceiling firestop. Slide the top attic insula-tion spacer onto the top of the attic insulation shield/firestop - See Diagram1a. Secure with 4 screws/nails. If more than one is required, these can bepurchased separately.Note: The ceiling firestop/firestop spacer may be cut down to size if this shieldis too high for the application.CEILING FIRESTOP/FIRESTOP SPACER( PART # 946-757)Used in conjunction with the 946-755 Vertical flex kit and 946-756 kit Verticalflex extension kit/Horizontal power vent kit.CEILING FIRESTOP/FIRESTOP SPACER( PART # 946-757)Used in conjunction with the 946-755 Vertical flex kit and 946-756 kit Verticalflex extension kit/Horizontal power vent kit.1Part # 946-758Used in applications where flex venting is used.