combustion appliance safety inspection includes - Carbon monoxide test, draft
measurement, spillage evaluation, worst-case depressurization test
when do you have to do a blower door test? - insulation of 15% or more of building
envelope, sealing ducts outside the thermal envelope, air sealing, attic insulation
when do you have to do a combustion safety test? - whenever changes to the building
thermal envelope and or heating system are made
when do you have to inspect gas line and repair leaks - In homes with natural
gas/propane service
ASHRAE 62-89 step1 - Calculate the ventilation required for a building: 0.35xvolume/60
ASHRAE 62-89 step2 - Calculate the ventilation required for people= airflow=15x
occupants
ashrae 62-89 step 3 - use the higher of the air flow requirements and convert to cfm50-
minimum cfm50= airflowxN
when do you recommend mech ventilation? - when final CFM50 is less than airflow
recommended and more than 70% of that airflow
When do you require mech ventilation - when CFM50 is less than 70% of CFM50- must
be continuos operation
R-value per inch cellulose loose fill - 3.7 per inch
R-value per inch fiberglass bats - 3.0 per inch
Combustion Safety Test Procedure (CSTP) - 1. Measure Base Pressure
2. Establish Worst Case
3. Measure CAZ depressurization, spillage draft, CO
4. Measure spillage, draft, CO under Natural conditions (if necessary)
5. Measure ambient CO
6. Action Levels
CSTP Step 1- Measure Base Pressure - Close Windows, doors, fireplace dampers
Turn off HVAC and exhaust fans
set combustion appliance to pilot
measure pressure in combustion appliance zone (CAZ) with respect to the outside
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