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Many simplified models have been developed and are used around the world to estimate the infiltration rate for Energy Performance (EP) calculations, with different levels of accuracy, as described below. For example, the wind velocity can be estimated hourly, monthly or annually; based on the local climate or fixed estimated values; with or without taking into account shielding factors; etc.

AIVC's Ventilation Information Paper #46 aims to explain these simplified models and give some examples of methodologies applied in various countries.

AIVC's Ventilation Information Paper #45.8 summarizes current knowledge on trends in building and ductwork airtightness in China.

AIVC's Ventilation Information Paper #45.7 summarizes current knowledge on trends in building and ductwork airtightness in Greece.

A recorded presentation covering this topic is also available at this link.

Many differences exist between countries in the requirements and regulations for ventilation of dwellings, offices, classrooms and other spaces. Sometimes the variation of the ventilation requirements for the same building type between countries is more than a factor of five. There are strong drivers, e.g., climate change, to reduce energy consumption for HVAC and therefore these variations are worth examining. Before reducing ventilation rates, it is critical to understand the reasons behind them.

AIVC's Ventilation Information Paper #45.6 summarizes current knowledge on trends in building and ductwork airtightness in France.

A recorded presentation covering this topic is also available at this link.

AIVC's Ventilation Information Paper #45.5 summarizes current knowledge on trends in building and ductwork airtightness in Latvia.

A recorded presentation covering this topic is also available at this link.

AIVC's Ventilation Information Paper #45.4 summarizes current knowledge on trends in building and ductwork airtightness in Belgium.

A recorded presentation covering this topic is also available at this link.

AIVC's Ventilation Information Paper #45.3 summarizes current knowledge on trends in building and ductwork airtightness in the Czech Republic.

A recorded presentation covering this topic is also available at this link.

AIVC's Ventilation Information Paper #45.2 summarizes current knowledge on trends in building and ductwork airtightness in Spain.

A recorded presentation covering this topic is also available at this link.

AIVC's Ventilation Information Paper #45.1 summarizes current knowledge on trends in building and ductwork airtightness in Estonia.