Engineered Ventilation

If engineered ventilation is installed, or you are considering engineered ventilation for the home, fill in the corresponding fields in the HVAC system / engineered ventilation section. HRV and ERV efficiency ratings are entered as a decimal number, so an ERV unit with sensible and latent efficiency ratings of 65 and 56 are entered as .65 and .56 respectively.

Engineered Ventilation- CoolCalc Documentation

When there is just an exhaust fan running (no intake) it typically means you are relying on creating a negative pressure situation and using infiltration to make up the fresh air.

Exhaust FAN- CoolCalc Documentation