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3 Ways to Measure Airflow for Rooftops and Other HVAC Equipment

One of the most common reasons for rooftop service calls is incorrect airflow.  Low airflow will often lead to frozen evaporator coils, low pressure trips, sweating ductwork and low...... Read More

Can you use a standard rooftop for a makeup air application?

We get asked this question often. And for good reason, DOAS equipment is expensive.  If a building owner needs makeup air, in most cases a DOAS will be required....... Read More

How to Calculate Cooling Capacity for a DOAS unit

This is an easy calculation if you know the cfm (airflow to be conditioned) and have a psychrometric chart handy.  The formula for calculating total cooling is: Qt = cfm x (Hf-Hi)...... Read More

How to design a DOAS unit as sole source heating and cooling

When possible, it makes life easy to have a separate DOAS system from the space HVAC system. In this case, each system has one specific job:¬†-The DOAS’s job is...... Read More

HVAC swimming pool design

Did you know that the HVAC equipment for indoor pool applications should not be installed directly above the swimming pool area? Warm moist air, which might contain airborne chemicals like...... Read More

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