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No Data Tag, No Problem

Q: “I need to replace this RTU but there is no data tag (or it’s not legible). How do I know what size unit I need?” With no data...... Read More

Economizer, ERV or DOAS?

At cfm we are often asked: “How much outside air can we bring in thru a standard RTU?” The short answer is you can bring in as much as...... Read More

Did you know that Rawal valves can help fix humidity issues?

For this solution to be successful, you will need to REDUCE the system airflow in addition to installing the Rawal valve.  Lowering system airflow does TWO things: It lowers...... Read More

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

Did you know: Hot Gas Reheat provides NO benefit on a design day?

Did you know: hot gas reheat operation (for dehumidification) provides NO benefit on a summer design day? This can be an easy mistake to make. (to clarify from the start, this is NOT...... Read More

How do you fix a humidity problem?

Humidity, the 8th wonder of the world, is a tough nut to crack. Unlike sensible heat transfer, it’s very difficult to measure its movement into buildings through cracks, doorways, and other openings.But,...... Read More

Are rooftops a commodity? Maybe.

Are rooftops a commodity?Maybe.But there is a lot to think about when replacing an existing unit, or doing a design/build job.Is quick and easy access important? Maybe we should...... Read More

EER, IEER, SEER, IPLV, HSPF… What do all of these efficiency terms REALLY mean

EER, IEER, SEER, IPLV, HSPF… You have probably seen all of these terms before and never even thought of what the heck they stand for, or why you would...... Read More

Airside economizers: Are they required on your project and are they a good investment?

Airside economizers are very simple in theory. Their function is to shut off the unit’s compressors and provide “free cooling” when the temperature outside is cold. Done, end of...... Read More

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