BPI IDL case studies
BPI IDL · Put your knowledge to work in context.
The Infiltration & Duct Leakage (IDL) credential appears in the Building Performance Institute's published list of certifications, where it is named "Infiltration & Duct Leakage" and linked from BPI's Resources section alongside other individual certifications such as Building Analyst Technician, Energy Auditor, Air Leakage Control Installer, and Healthy Home Evaluator. BPI describes its mission as advancing the home performance industry through nationally recognized standards and credentials intended to help ensure homes are comfortable, healthy, safe, durable, and energy efficient, and it presents itself as "The symbol of excellence for home performance professionals." This independent study page is not affiliated with or endorsed by BPI. The BPI IDL case studies are 5 cases and about 4,449 words.
1Duct Leakage Test on a Zoned System With a Sealed Register
You are performing a total duct leakage test to a target pressure of 25 Pa on a two-story house with a single central air handler and two motorized zone dampers. Before the test you tape off all supply and return registers and seal the air handler cabinet opening.
958 words, about 5 min2Blower Door Reads High Baselines on a Windy Afternoon
You arrive at a 1,900 square foot single-family house at 2 p.m. on a day with sustained 18 mph winds and gusts to 30 mph.
845 words, about 4 min3Pressure Pan Readings Disagree With the Whole-House Test
A 2,200 square foot ranch has a centrally located air handler with supply ducts in the vented attic and return ducts in a chase that runs through the attic. You run a blower door to -50 Pa and take pressure pan readings at each register.
803 words, about 4 min4Documentation Conflict: Two Technicians, Two Numbers
A quality-control reviewer is auditing a file for a 2,600 square foot house. The file contains two blower door reports.
840 words, about 4 min5Safety Stop During a Depressurization Test With a Combustion Appliance
You are running a blower door depressurization test on a 1,500 square foot house with a natural-draft gas water heater in an interior closet and a gas furnace in the attached garage. The house is at -50 Pa and holding for a multipoint series.
1,003 words, about 5 min