Desa H) AND VM42EP(B Owner's Operation And Installation Manual

Also see for H) AND VM42EP(B: OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL

Contents

www.desatech.com108796-01K 9INSTALLING TRANSITION PIPE ANDSTARTER COLLARThe transition pipe and starter collar shown inFigure 9 are supplied with the fireplace, unattachedand ready for installation. Remove the starter collarand set aside. Slide the transition pipe over the ventcollar and attach with a minimum of three screws.Replace the starter collar over the transition pipeand attach using four screws located on the legstands (five used on the model M42E). To installB-vent piping, slide the first piece of B-vent overthe transition pipe and attach with either a mini-mum of two screws or other means approved bythe vent manufacturer.Figure 9 - Installing Transition Pipe andStarter CollarB-Vent PipingTransition PipeStarter CollarVent CollarPRE-INSTALLATIONPREPARATIONContinuedVENTING INSTALLATIONA B-type venting system must be connected to theappliance for venting to the outside of the building.The following section is provided as a guide to astandard B-type vent installation.Standing codes requirements concerning B-typevent installations may vary within your state,province or local codes jurisdiction. Therefore,it is recommended that you check with yourlocal building codes for specific requirementsor in absence of local codes, follow Section 7.0of the current National Fuel Gas Code ANSIZ223.1/NFPA 54 and in Canada with CAN/CGAB149 for Category I systems using double wallB-1 vent pipe.This gas appliance must be vented to the outdoorsonly and may not be terminated into an attic spaceor into a chimney flue servicing a solid-fuel burn-ing appliance.This appliance may be vented through a manufac-tured chimney system or a masonry chimney usinga B-vent adapter or a chimney liner system if allare listed, inspected and approved by local codesand/or building authorities.The examples shown in Figure 10, page 10 aretypical of most B-vent installations and codespractices.Example 1: Shows the minimum allowable sys-tem height and lateral offset for a 60° degree orgreater inclination. Code specifies that offsets at60° degrees or greater are considered horizontaland must follow the 75% percent rule for lateralto total vertical system height. Codes also allowsonly one offset in the total system when at 60°degrees or greater. The total vertical height in thisexample represents the minimum height of 8 feetand therefore the allowable lateral is 6 feet whenthe 75% percent rule applies. If the lateral lengthmust exceed 75% then the system must be sized inaccordance with the Category I venting tables.Example 2: Shows a multiple offset each at 45°degrees of inclination. Multiple offsets are permit-ted if they do not exceed 45° degrees of inclination.The total lengths of the two offsets are not requiredto meet the 75% percent allowable rule.Example 3: Shows a single offset at 45° degreesof inclination and therefore the lateral length at10 feet of offset does not have to meet the 75%percent rule.In each case the offsets must be supported andfirestops must be positioned wherever the ventmust pass through a sub-floor, ceiling joist oran attic overhang. The vent pipe must terminatevertically into a listed type vent cap and extend asufficient height through an approved roof flash-ing, roof jack or a roof thimble. At all points thelisted clearances must be maintained.Vent terminations must be located in accordancewith height and proximity rules of NFPA No. 54 orCAN/CGA B149. These rules apply to vents at 12in. diameter or less and require a minimum heightin accordance with the roof pitch and a minimumof 8 ft. distance from a vertical wall or obstruction(see Figure 11, page 10).If venting horizontally through a side wall be-comes necessary, a listed thimble approved for usewith B-type vent must be used. Check with yourlocal codes before venting through a side wall.Some codes areas allow the use of existing B-typevent systems if the system is at or above the recom-mended diameter of the flue; in this case 6".