hausdok Posted October 25, 2013 Report Share Posted October 25, 2013 Hi all, Just had this. Scenario - a small uninsulated mechanical room attached to the end of a house. Inside is a boiler supplying hot water to hydronic baseboard convectors and a radiant floor heat system. The exhaust is a single-walled pipe that passes out through the plywood wall on one side, extends a couple of feet, turns downward and then ends. I could be wrong, but I suspect that the vent used to turn upward and had another section attached that's long-since been lost to the ages. The current homeowner purchased the house this way and has no idea if there used to be a connected vent. OK, so the vent needs six inches of clearance. That's easy. But since it's not venting into a dedicated stack I believe that vent should be a double-walled type because using a single-walled metal vent on the side of a house is going to end up with a lot of condensation occurring in the vent. Currently working on this report and have a short deadline. would like to not have to spend a lot of time digging around for the rules that state that the vent needs to be double-walled material and needs to extend up the side of the house and then clear the house/roof. If anyone can help me save a little time and has those cites handier than I do, please post them here. Much obliged to anyone that has 'em handy. ONE TEAM - ONE FIGHT !!! Mike Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted October 25, 2013 Report Share Posted October 25, 2013 Gas or oil? Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 26, 2013 Author Report Share Posted October 26, 2013 Oil, Crown Freeport (Philly) Model CTPR4, SN 39182R7JK. I would have called them directly to find out whether it's side-wall rated, etc. but by the time I got home it was past COB on the right coast. OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted October 26, 2013 Report Share Posted October 26, 2013 Assuming it's gas: G2427.6.3 (503.6.4) Gas vent termination. A gas vent shall terminate in accordance with one of the following: 1. Gas vents that are 12 inches (305 mm) or less in size and located not less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate above the roof in accordance with Figure G2427.6.3. G2427.6.4 (503.6.5) Minimum height. A Type B or L gas vent shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hoodor flue collar. A Type B-W gas vent shall terminate at least 12 feet (3658 mm) in vertical height above the bottom of the wall furnace. G2427.6.5 (503.6.6) Roof terminations. Gas vents shall extend through the roof flashing, roofjack or roof thimble and terminate with a listed cap or listed roof assembly. G2427.6.7 (503.6. Exterior wall penetrations. A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Sections G2427.2.1 and G2427.3.3. (Those have to do with mechanical venting, not natural draft.) G2427.7.2 (503.7.2) Cold climate. Uninsulated single- wall metal pipe shall not be used outdoors for venting appliances in regions where the 99-percent winter design temperature is below 32?F (O?C). G2427.7.3 (503.7.3) Termination. Single-wall metal pipe shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hoodoutlet or flue collar. Single-wall metal pipe shall extend at least 2 feet (610 mm) above the highest point where it passes through a roof of a building and at least 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm) (see Figure G2427.5.3). An approvedcap or roof assembly shall be attached to the terminus of a single- wall metal pipe (see also Section G2427.7.9, Item 3). G2427.7.4 (503.7.4) Limitations of use. Single-wall metal pipe shall be used only for runs directly from the space in which the appliance is located through the roof or exterior wall to the outdoor atmosphere. G2427.7.6 (503.7.6) Installation. Single-wall metal pipe shall not originate in any unoccupied attic or concealed space and shall not pass through any attic, inside wall, concealed space, or floor. The installation of a single-wall metal pipe through an exterior combustible wall shall comply with Section G2427.7.7. Single-wall metal pipe used for venting an incinerator shall be exposed and readily examinable for its full length and shall have suitable clearances maintained. G2427.7.7 (503.7.7) Single-wall penetrations ofcombustible walls. Single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point ofpassage by a ventilated metal thimble not smaller than the following: blah, blah (I can cut & paste more, but I think you've got enough.) Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted October 26, 2013 Report Share Posted October 26, 2013 For Oil: M1804.1 Type ofvent required. Appliances shall be provided with a listed and labeled venting system as set forth in Table MI804.1. TABLE M1804.1 VENT SELECTION CHART VENT TYPES APPLIANCE TYPES Type L oil vents -Oil-burning appliances listed and labeled for venting with Type L vents Pellet vents- Pellet fuel-burning appliances listed and labeled for use with pellet vents M1803.3.1 . . . Connectors for oil-fired appliances listedand labeledfor Type L vents, passing through walls or partitions shall be in accordance with the following: 2. Single-wall metal pipe shall be guarded by a ventilated metal thimble not less than 4 inches (102 mm) larger in diameter than the vent connector. A minimum 6 inches (152 mm) of clearance shall be maintained between the thimble and combustibles. M1804.2.3 Natural draft appliances. Vents for natural draft appliances shall terminate at least 5 feet (1524 mm) above the highest connected appliance outlet, and natural draft gas vents serving wall furnaces shall terminate at an elevation at least 12 feet (3658 mm) above the bottom of the furnace . I can't find anything that would prohibit a single wall vent connector in an unheated space for an oil appliance. Bottom line is that they can't use single-wall as the vent, they can only use it as the vent connector. Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 26, 2013 Author Report Share Posted October 26, 2013 Thanks to those who responded publicly and via private message. Much appreciated. I was able to cut and paste without spending a lot of time searching around for those cites because you helped. Report just went out via email. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
Jim Baird Posted October 26, 2013 Report Share Posted October 26, 2013 ...that is why we and you are here...appreciate this site... Quote Link to comment Share on other sites More sharing options...
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