The Angle Optimization test is a hyper crucial step of the HAVEN Monitor installation. We have a fun internal name for it… The ANGLE OF ATTACK! Don’t worry, it’s not as scary as it sounds. It’s essentially saving you (the HVAC technician who’s installing HAVEN at a home) from a scary situation: a bad installation. We all know the pain of having to return to a home when something wasn’t done right the first time. This should save you the headache and help you roll one less truck.

What’s being measured?

The HAVEN Monitor is equipped with a proprietary sensor for airflow measurements, similar to a hot-wire anemometer.

Just like a hot-wire anemometer, this measurement accurately represents airflow in the probe’s current position, but it may not reflect the average airflow readings across the cross-section of this duct.

How does it work?

Once you’ve done the work of drilling the hole in the duct and applying the adhesive alignment plate, we need to test the airflow speed at the installation location. We do this by having you insert the probe into the hole and starting the test.

  1. Don’t secure the mounting plate yet!

  2. Turn on the air handler.

  3. Don’t secure the mounting plate yet!

  4. Select the LOWEST fan speed.

    Why? The reason we ask for the lowest speed is to ensure HAVEN will get accurate readings no matter what speed the air handler fan is set to post-installation. The sensor requires a minimum of 80fpm (0.4m/s), so if the lowest fan speed doesn’t meet this criteria, you can help the homeowner know to set up their fan schedule at a higher speed to get accurate IAQ readings.
  5. Insert the probe, but don’t secure the mounting plate yet! You can tell we like to stress that point a lot. Why? The mounting plate needs to be rotated during the test.

  6. Ok, back to inserting. Here are the guidelines:

    a. TZOA logo on the mounting plate should be parallel to expected airflow.


    b. Airflow should be moving from A to T of logo.


    c. Observe how the markings on the metal alignment plate line up with the notch in the mounting plate.



  7. Follow the instructions, holding the mounting plate at one position for 15 seconds, then rotating the mounting plate into 2 additional positions to test the airflow angle and direction. You’ll start at C, then A, then E.



  8. HAVEN will guide you back to the position that offered the best, most stable airflow. You can FINALLY secure the mounting plate. Phew.



  9. Success! You’ve pretty much guaranteed a successful installation now. Finish up the last steps in the app and say “Adios!” to your customer.



There are a couple scenarios you should know about. Don’t worry, the app will tell you what to do in each of them.

  1. Wrong airflow direction:

    1. If you have the probe inserted with the airflow moving in the INCORRECT direction over the sensor (from T to A on the mounting plate), the app will tell you to rotate it 180° and redo the test. Problem should be solved. Otherwise, feel free to call our 1-800 toll-free number: 1-833-4-IAQ-PRO.



  2. No or low airflow:

    1. If the lowest fan speed is below 80fpm (0.4m/s), HAVEN may show you a 0fpm (0m/s) reading. We do this to emphasize that these readings will not offer accurate airflow, particle, RH or temperature readings once installed.

    2. Sometimes all it takes is rotating the mounting plate a little more.

    3. Sometimes it could be that you’ve missed the step to turn on the air handler.

    4. Other times it could be that the lowest fan speed just won’t cut it and you need to up it to the next one. In this scenario, it’s important to then update the homeowner’s thermostat schedule to use that speed during any fan-only activity for best results.

    5. Once in a while, the installation location you’ve chosen may not offer the best results which means needing to move it to a narrower section of duct. This should be the last resort, after trying the above options.



  3. I’m seeing the airflow readings in m/s when I want to be seeing them in fpm:

    1. Easy fix! Just go back to the “Fine Tune” step where it was asking you for a Reference Velocity Reading. Make sure “fpm” is selected from the dropdown menu. You don’t have to enter the reference measurement if you don’t want to, just click “Skip”.





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