Inspector Information Page
Below are some links to pages we've found useful. Hope they help!
* Ducane Air Conditioner Manufacture Date Determination: www.mcgarryandmadsen.com/inspection/Blog/Entries/2016/9/23_How_can_I_tell_the_age_of_a_Ducane_air_conditioner_from_the_serial_number.html
* Air volume required for gas fired equipment: 50 cubic feet of air is needed for each 1000 btu
or
if using an outside air source for combustion air, the (pipe) opening must be a minimum of 40 sq in=(120,000 btu / 3,000)
or
if using indoor air, implementation is the installation of an air intake grill from an open indoor area:
with an 8 foot ceiling, the grill size should be:
50,000 btu = 18' x 18'
75,000 btu = 20' x 24'
100,000 btu = 25' x 25'
125,000 btu = 26' x 30'
The key is to make sure that depressurization does not occur in the room where the fuel burning appliance is located. Testing using a manometer should be performed to determine if depressurization is occurring in the furnace room during exhaust fans or other activities in the home. Also, testing the exhaust flue draft while all exhaust fans and clothes dryers are operating (with windows and doors closed) is a good test that can determine if sufficient combustion air is present, without pulling combustion air away from the fuel burning appliance(s) being tested.
Combustion air calculator at State of Kentucky Dept of Housing web site: www.dhbc.ky.gov/NR/rdonlyres/...calculator.xls
WSSC Air Calculator: http://www.houseofcraig.net/combustion_air_calc.html
NFPA Gas Fired Appliance Combustion Air Requirements: www.nfpa.org/-/media/Files/News-and-Research/Resources/Research-Foundation/rfcombustionairrequirements.ashx?la=en
* Air volume required for gas fired equipment: 50 cubic feet of air is needed for each 1000 btu
or
if using an outside air source for combustion air, the (pipe) opening must be a minimum of 40 sq in=(120,000 btu / 3,000)
or
if using indoor air, implementation is the installation of an air intake grill from an open indoor area:
with an 8 foot ceiling, the grill size should be:
50,000 btu = 18' x 18'
75,000 btu = 20' x 24'
100,000 btu = 25' x 25'
125,000 btu = 26' x 30'
The key is to make sure that depressurization does not occur in the room where the fuel burning appliance is located. Testing using a manometer should be performed to determine if depressurization is occurring in the furnace room during exhaust fans or other activities in the home. Also, testing the exhaust flue draft while all exhaust fans and clothes dryers are operating (with windows and doors closed) is a good test that can determine if sufficient combustion air is present, without pulling combustion air away from the fuel burning appliance(s) being tested.
Combustion air calculator at State of Kentucky Dept of Housing web site: www.dhbc.ky.gov/NR/rdonlyres/...calculator.xls
WSSC Air Calculator: http://www.houseofcraig.net/combustion_air_calc.html
NFPA Gas Fired Appliance Combustion Air Requirements: www.nfpa.org/-/media/Files/News-and-Research/Resources/Research-Foundation/rfcombustionairrequirements.ashx?la=en
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