BPI Building Analyst Field Exam Blower Door 2026/ 2027 Study Materials with Solution

BPI Building Analyst Field Exam Blower Door

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Terms in this set (5)


- for air leakage (infiltration or exfiltration) to
Basic dynamics of air occur, there must be both a hole or crack, and a
leakage in buildings driving force (pressure difference) to push the
air through the hole.

, - as warm air rises due to the stack effect, it
tends to escape through cracks and holes near
the top of the building
- this escaping air causes a slight negative
pressure at the bottom of the building which
pulls cold air through holes in the lower level
- AIR SEALING activities should usually begin at
the TOP of the building because this is where the
largest POSITIVE pressure exist and where many
Common air leakage of the leakage sites can be found (and potential
sites condensation problems)
- AIR SEALING should next be focused in the
lowest part of the building because it will have
the largest NEGATIVE pressures (which includes
cold air infiltration)
- IMPORTANT to seal the top of the building first
before doing the lower part of the building
because if the top is not sealed, then it can
potentially create backdrafting in combustion
appliances