Yes. Many rooftop packaged HVAC systems can introduce outdoor air into the building through a dedicated fresh-air intake.

The amount of outdoor air depends on building use, occupancy, ventilation requirements and the selected equipment configuration.

What is a fresh-air hood?

A fresh-air hood is an outdoor-air intake assembly installed on the rooftop unit. It helps introduce outside air while reducing direct entry of rain and debris.

What is an economizer?

An economizer is a more advanced outdoor-air control system that can increase outdoor-air intake when external conditions are suitable for free cooling.

Economizer operation depends on climate, control strategy and equipment configuration.

Does fresh air affect equipment capacity?

Yes. Outdoor air introduces additional sensible and latent load into the HVAC system. The required cooling or heating capacity should therefore consider the design fresh-air quantity.