This sketch of a barometric damper used on oil fired heating equipment (heating boilers or water heaters) is provided courtesy of Carson Dunlop Associates (found at page bottom, Click to Show or Hide). The gas pressure in the chimney needs to be less than atmospheric pressure in the boiler room for gases to leave. ![]() ![]() Notice that we're using negative numbers for draft measurement - that's because gases in the flue are moving up, up, and away, like superman, and onwards out of the building - away from the heating equipment. Where do we Measure Chimney or Flue Draft & What is the Correct Draft Measurement at Oil Fired Heaters?ĭraft at two locations: over the fire or in the combustion chamber where typically we may see -0.02 to -0.03 inches of water column pressure,Īnd in the breech or at the stack pipe (properly, the flue vent connector) measured just a few inches above the boiler orįurnace top, and before the barometric damper itself. Without this regulation (hence the term "draft regulator") as building and outdoor conditions vary (wind, doors open or shut, temperature etc), the draft seen by the heating appliance will vary, making maintenance of proper combustion conditions at the oil burner impossible.Ī typical draft regulator is deceptively simple: The hinged door opens or closes to let extra air into the flue to assure that the draft in the flue remains constant at the proper setting needed for proper heating system operation.ĭetails about draft control for gas fired heating systems, including LP or natural gas fueled furnaces or boilers, are discussed separatelyĪt DRAFT HOOD, GAS HEATER On gas fired equipment. Where & How Do We Measure Chimney Draft or Heating Appliance Flue Draft?Īs we explain at our home page for this topic,Ī barometric draft control, also called a "damper" or barometric damper, is a hinged, weighted door on an opening at a heating flue.īarometric dampers are used on oil-fired heating appliances (furnaces, boilers, water heaters) to assure constant draft and thus uniform combustion. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects. This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. This article explains the methods of measurement and proper adjustment settings for draft regulators or barometric dampers on oil fired heating equipment. How to measure draft at heating equipment or at chimneys. We have no relationship with advertisers, products, or services discussed at this website. Field Draft Controls maintain consistent draft by counteracting the negative forces caused by changes in temperature and barometric pressure, as well as the effects of wind.InspectAPedia tolerates no conflicts of interest. Field Controls Draft Control, 6 in Damper. Google Patents Barometric draft controlĭownload PDF Info Publication number US2475799A US2475799A US686507A US68650746A US2475799A US 2475799 A US2475799 A US 2475799A US 686507 A US686507 A US 686507A US 68650746 A US68650746 A US 68650746A US 2475799 A US2475799 A US 2475799A Authority US United States Prior art keywords damper ring barometric draft control pinion Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. The negative forces caused by changes in temperature and barometric pressure, as well as the effects of wind. ![]() Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US686507A Inventor Edward B Moore Current Assignee (The listed assignees may be inaccurate. Field Controls 6'MG1 Double Acting Barometric Draft Control, LP/Natural Gas Mfg. Original Assignee Sears Roebuck and Co Priority date (The priority date is an assumption and is not a legal conclusion. Name: Field Controls Co MPN: 6'MG1 Brand: Field Controls UPC: 090747200009 APR Part : 15854 Your: Min. Interval: 1 Please contact APR Supply to Purchase Field Controls 6'MG1. Log In for Pricing and Availability FIELD CONTROLS BAROMETRIC DAMPER 5,6,7. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.
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