HomeMy WebLinkAboutImage (11) Makeup Air Opening Table for New and Existing Dwelling
Ta le 1 12
One or multiple power O e- r multiple 'n- O atmospherically Multiple atmospherically
vent,direct vent assisted appliances and v ted gas or oil vented gas or oil Duct diameter
appliances,or no power vent or direct ppliance or one solid appliances or solid fuel
combustion appliances vent appliances fuel appliance appliances
Column A Column C Column D
Passive opening 1-36 1-22 1-15 1-9 3
Passive opening 37-66 23-41 16-28 10-17 4
Passive opening 67-109 42-66 29-46 18-28 5
Passive opening 110-163 67-100 47-69 29-42 6
Passive opening 164-232 101-143 70-99 43-61 7
Passive opening 233—317 144—195 100—135 62—83 8
Passive opening 318-419 196-258 136-179 84-110 9
w/motorized damper
Passive opening 420—539 259—332 180—230 111-142 10
w/motorized damper
Passive opening 540—679 333—419 231—290 143—179 it
w/motorized damper
Powered makeup air 1 >679 >419 1 >290 1 >179 1 NA
Notes:
A. An equivalent length of 100 feet of round smooth metal duct is assumed. Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to
determine the remaining length of straight duct allowable.
B. If flexible duct is used,Increase the duct diameter by one Inch. Flexible dud shall be stretched with minimal sags. Compressed dud shall not be accepted.
C. Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed.
D. Powered makeup air shall be electrically interlocked with the largest exhaust system.
Section F
Combustion air
Not required per mechanical code(No atmospheric or power vented appliances)
Passive(see IFGC Appendix E,Worksheet E-1) Size and type
Other,describe:
Explanation-If no atmospheric or power vented appliances are installed,check the appropriate box,not required. If a power
vented or atmospherically vented appliance installed, use/FGCAppendix E, Worksheet E-1 (see below). Please enter size and type.
Combustion air vent supplies must communicate with the appliance or appliances that require the combustion air.
Section F calculations follow on the next 2 pages.
I:\Building\SafetyPolicieslnformation\EdinaExuwServer\Docx's\RESIDENTIAL SD05 VENTILATION MAKEUP AND COMBUSTION AIR CALCS.pdf
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