Desa M36E(B,H) Owner's Operation And Installation Manual

Also see for H): OWNER'S OPERATION AND INSTALLATION MANUAL Owner's operating and installation manual

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Desa M36E(B,H) Owner's Operation And Installation Manual Manual pdf 9 page image

www.desatech.com108796-01T 9INSTALLING TRANSITION PIPE ANDSTARTER COLLARThe transition pipe and starter collar shownin Figure 9 are supplied with fireplace, unat-tached and ready for installation. Removestarter collar and set aside. Slide transitionpipe over vent collar and attach with a mini-mum of three screws. Replace starter collarover transition pipe and attach using fourscrews located on leg stands (five used onmodel M42E). To install B-vent piping, slidefirst piece of B-vent over transition pipe andattach with either a minimum of two screwsor other means approved by the vent manu-facturer. Figure 9 - Installing Transition Pipe andStarter CollarB-Vent PipingTransition PipeStarter CollarVent CollarPreINstallatIoN PreParatIoNContinuedVeNtING INstallatIoNat 60° or greater. The total vertical height inthis example represents the minimum heightof 8 feet and therefore the allowable lateralis 6 feet when the 75% rule applies. If thelateral length must exceed 75% then thesystem must be sized in accordance with theCategory I venting tables.Example 2: Shows a multiple offset each at45° of inclination. Multiple offsets are permit-ted if they do not exceed 45° of inclination. Thetotal lengths of the two offsets are not requiredto meet the 75% allowable rule.Example 3: Shows a single offset at 45° ofinclination and therefore the lateral length at10 feet of offset does not have to meet the75% rule.In each case the offsets must be supportedand firestops must be positioned whereverthe vent must pass through a sub-floor, ceil-ing joist or an attic overhang. The vent pipemust terminate vertically into a listed type ventcap and extend a sufficient height throughan approved roof flashing, roof jack or a roofthimble. At all points the listed clearancesmust be maintained.Vent terminations must be located in ac-cordance with height and proximity rules ofNFPA No. 54. These rules apply to vents at12" diameter or less and require a minimumheight in accordance with the roof pitch and aminimum of 8 ft. distance from a vertical wallor obstruction (see Figure 11, page 10).A B-type venting system must be connectedto appliance for venting to the outside ofbuilding.The following section is provided as a guideto a standard B-type vent installation.Standing codes requirements concerning B-type vent installations may vary within yourstate, province or local codes jurisdiction.Therefore, it is recommended that you checkwith your local building codes for specificrequirements or in absence of local codes,follow Section 7.0 of the current National FuelGas Code ANSI Z223.1/NFPA 54.This gas appliance must be vented to theoutdoors only and may not be terminated intoan attic space or into a chimney flue servicinga solid-fuel burning appliance.This appliance may be vented through amanufactured chimney system or a masonrychimney using a B-vent adapter or a chim-ney liner system if all are listed, inspectedand approved by local codes and/or buildingauthorities.The examples shown in Figure 10, page 10are typical of most B-vent installations andcodes practices.Example 1: Shows the minimum allowablesystem height and lateral offset for a 60° orgreater inclination. Code specifies that offsetsat 60° or greater are considered horizontaland must follow the 75% rule for lateral tototal vertical system height. Codes also al-low only one offset in the total system when