Skip to content

Resource Library

Air Leakage Calculator

Website

Overview

Use the SLA calculator to measure how much air is entering and escaping a building, helping to improve your overall air quality.

SLA stands for specific leakage area and is a method of describing how much air enters or escapes from a building (building air infiltration). The lower the number the tighter (less leaky) a building is. Air leakage is important as the air escaping from the building represents energy loss.

Buildings with high SLAs are drafty, uncomfortable, and hard to heat and cool. Conversely, a building with too low of an SLA can experience problems with moisture, and mold and have overall poor indoor air quality.

Use Efficiency First California’s SLA Calculator to calculate CFM50 for any area of conditioned floor space.

Related Resources

Download this BPA resource

Principles for Conducting Remote Audits on Single and Multi Family Homes

Download the principles from BPI for remote audits on single and multifamily homes.

Hyperlink icon to reveal a BPA Resource Video

Home Diagnosis TV: S1 Ep3 Flipping a House for Performance 

Watch as Grace and Corbett drive their TinyLab​ to a split-level ranch that hasn't been updated in decades.

Hyperlink icon to reveal a BPA Resource Video

The “V” in HVAC with Allison Bailes 

Watch as Mighty Homes and Allison Bailes discuss 17 steps to improve duct systems.