https://structuretech1.com/combustion-air-duct-connected-to-return-plenum/

Apr 9, 2013 ... A combustion air duct connected directly to the furnace return ... setup pulls cold outdoor air in to the house, directly in to the return plenum for the furnace. ... Minnesota State Mechanical Code no longer allows the combustion ...

http://www.startribune.com/combustion-air-ducts-part-iii-a-direct-connection-to-the-return-plenum/202485371/

Apr 11, 2013 ... A combustion air duct connected directly to the furnace return ... setup pulls cold outdoor air in to the house, directly in to the return plenum for the furnace. ... Minnesota State Mechanical Code no longer allows the combustion ...

https://codes.iccsafe.org/content/MMFGC2015/chapter-6-duct-systems

Minnesota Mechanical and Fuel Gas Code. ... material directly into any combustion chamber, shall conform to the requirements of NFPA 82. ... Exhaust systems located in ceiling return air plenums over spaces that are permitted to have 10 ...

https://naturalspacesdomes.com/wp-content/uploads/2017/06/CombustionAir.pdf

AIR. Minnesota Department of Commerce Energy Information Center. How to test ... stoves use large amounts of air in the combustion process. .... which brings outside air into the return air duct, ... To reduce cold air around the furnace, build a.

https://www.dli.mn.gov/sites/default/files/pdf/ResCodeTraining.pdf

amended by the State of Minnesota, that: ..... Make-up air & combustion air systems (if installed). Type, location ..... Heat and moisture always flow from warm to cold. ...... Heat Recovery Ventilator. Supply Air. Exhaust Air. Outdoor Air. Return Air.

http://www.ductworkinstallation.com/EnergySaving/CombustionAirIntake/tabid/94/Default.aspx

How to Stop Cold Air from Fresh Air (Combustion Air) Vent in Furnace Room Question My family and I live in MN. Every winter I have dealt with issues of cold air ...

https://hvacrassets.net/handouts2/CombustionAir.pdf

AIR. Minnesota Department of Commerce Energy Information Center. How to test for ... cold outside, windows and doors are shut. ... stoves use large amounts of air in the combustion process. ... is an opening in the vent pipe above the furnace .

https://www.nrel.gov/docs/fy13osti/55493.pdf

Combustion air and vent terminal locations (Source: 2012 National Fuel Gas Code, ..... if outdoor air for combustion is not used, is on the order of 1% in cold ... at design conditions in Minneapolis (-11°F) may be sized for 80,000 Btu/hr with a  ...

http://www.inspectionnews.net/home_inspection/heating-ventilation-air-conditioning-hvac-home-inspection-and-commercial-inspection/16859-can-furnace-combustion-air-pulled-attic.html

Dec 6, 2009 ... Could the combustion air for the furnace be piped in with pvc pipe from my attic area? ... that air is replaced by cold outside air that will then need to be heated. .... The State of Minnesota prohibits (through an amendment to the code) ... The return air for the furnace to heat and then put back the heated air ...

https://www.energycodes.gov/sites/default/files/documents/cn_open_spaces_as_return-air_options.pdf

Stud cavities and floor joist spaces are often used to return air to the heating, ... Leaks within areas that include combustion appliances do not meet the code, ...