Calculating BAS (Building Airflow Standard) - 1) Calculate BAS based on Volume, then
2) calculate based on Occupancy, then 3) Take the higher of the two standards
One inch of Water Column - 250 Pascals
3 Forms of Heat Transfer - Convection, Conduction, Radiation
How Many BTUs in 1 kWh? - 3412
How many BTUS in 1 Therm of Gas - 100,000
Heat Load - Used to measure appliance capacity
Heat Loss - Total Seasonal Heat Loss
CFM50 - CFMn*NC
NC - "N" Correction factor from LBL charts
Occupancy BAS - Required Airflow = 15 cfm * # of occupants
Volume BAS - .35 * Volume/60
CO >35 ppm - 1) Disable appliance 2)Repair before proceeding
AFUE - Annual Fuel Utilization Efficiency
AFUE (Annual Fuel Utilization Efficiency) - Efficiency of unit in operation (with
starts/stops) UNIT ONLY
Seasonal Efficiency - TOTAL system efficiency. AFUE PLUS distrib losses, average
over course of heatin season
5 minutes - Length of time that a combustion appliance should run to achieve"Steady
State Efficiency"
60 Seconds - Amount of permissible time after ignition that spillage is allowable from the
flue.
Backdrafting - Continuous Spillage
"Draft Measurement" is done in both Category I and IV heating systems. - False
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