Regency ® P121-10/P131-10 Zero Clearance Direct Vent Gas Fireplace | 2525|installationDiagram 3Diagram 5Diagram 2NOTE: For best results and optimum perfor-mance with each approved venting system, it ishighly recommended to apply “Mill-Pac” seal-ant (supplied) to every inner pipe connection.Failure to do so may result in drafting or per-formance issues not covered under warranty.3) A Firestop spacer must be installed in thefloor or ceiling of every level. To install theFirestop spacer in a flat ceiling or wall, cuta 10 inch square hole. Frame the hole asshown in Diagram 3 and install the firestop.4) Assemble the desired lengths of pipe andelbows. Ensure that all pipes and elbowconnections are in the fully twist-lockedposition and sealed.5) Cut a hole in the roof centered on the smalldrilled hole placed in the roof in Step 2. Thehole should be of sufficient size to meetthe minimum requirements for clearanceto combustibles of 1-1/4". Slip the flashingunder the shingles (shingles should overlaphalf the flashing) as per Diagram 4.Diagram 4: The upper half of the flashing isinstalled under the roofing material and notnailed down until the chimney is installed.This allows for small adjustments.6) Continue to assemble pipe lengths.Note: If an offset is necessary in the attic toavoid obstructions, it is important tosupport the vent pipe every 3 feet, toavoid excessive stress on the elbows,and possible separation. Wall straps areavailable for this purpose (Diagram 2).Galvanized pipe is desirable above the rooflinedue to its higher corrosion resistance. Continueto add pipe sections through the flashing untilthe height of the vent cap meets the minimumheight requirements specified in Diagram 5 orlocal codes. Note that for steep roof pitches,Diagram 3Diagram 4Diagram 57) Before connecting the horizontal run of ventpipe to the vent termination, slide the WallThimble over the vent pipe.8) Slide the appliance and vent assemblytowards the wall carefully inserting thevent pipe into the vent cap assembly. It isimportant that the vent pipe extends intothe vent cap sufficient distance so as toresult in a minimum pipe overlap of 1-1/4inches. Secure the connection between thevent pipe and the vent cap by attaching thetwo sheet metal strips extending from thevent cap assembly into the outer wall of thevent pipe. Use the two sheet metal screwsprovided to connect the strips to the pipesection. See Diagram 4.9) Install wall thimble in the center of the10" square and attach with wood screws(Diagram 5).Roof Pitch Minimum Vent HeightFeet Metersflat to 7/12 2 0.61over 7/12 to 8/12 2 0.61over 8/12 to 9/12 2 0.61over 9/12 to 10/12 2.5 0.76over 10/12 to 11/12 3.25 0.99over 11/12 to 12/12 4 1.22over 12/12 to 14/12 5 1.52over 14/12 to 16/12 6 1.83over 16/12 to 18/12 7 2.13over 18/12 to 20/12 7.5 2.29over 20/12 to 21/12 8 2.44VERTICALTERMINATIONS1) Maintain the 1-1/4" clearances(air spaces) to combustibles whenpassing through ceilings, walls,roofs, enclosures, attic rafter, or othernearby combustible surfaces. Donot pack air spaces with insulation.Check the "Venting Arrangement"section for the maximum verticalrise of the venting system andthe maximum horizontal offsetlimitations.2) Set the gas appliance inits desired location. Drop aplumb bob down from theceiling to the position of theappliance flue exit, and mark the locationwhere the vent will penetrate the ceiling.Drill a small hole at his point. Next, drop aplumb bob from the roof to the hole previouslydrilled in the ceiling, and mark the spot wherethe vent will penetrate the roof. Determineif ceiling joists, roof rafters or other framingwill obstruct theventing system.You may wishto relocate theappliance or tooffset, as shownin Diagram 2 toavoid cutting loadbearing mem-bers.