Frequently Asked Questions - Fans | Retrotec

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What are the manufacturer's recommendations for equipment calibration?

Answer

​Our manufacturer's recommendation for calibration is as follows:

  • ​​Retrotec fans: Every 5 years.
  • DM-2 Mamometer: Every 2 years or if the Mamometer fails a field check.
  • DM32 / DM32 WiFi Mamometer: Every 5 years or if the Mamometer fails a field check.

Please review the DM32 and DM-2 Manuals on how to perform a field check.

This only covers our manufacturer recommendation. The energy standards (EN13829, ASTM, ATTMA, USACE, etc...) that you are using for test results may have different calibration intervals. Please consult the energy...

Is using a positive duct test pressure advantageous?

Answer

The main disadvantage to positive duct test pressure is that it blows off register seals or makes them leak. An LBL study showed a wide dispersion of results when the same duct test was repeated many times. Depressurizing will allow the use of lower sticking masking materials that are less likely to pull off the paint. In some cases plastic food wrap will work.

The main advantage to positive duct test pressure is that the flex duct doesn't contract as much. In cases where the flex runs to the ceiling this contraction effect might cause problems.

Testing using...

Should I tape over the L ranges on my 1000/2000/3000 series fan?

Answer

​The L ranges on the fan are designed to be left open unless you are using L2 or L1.

Covering those four 1 inch holes in the center of the C8 plate will cause range C1 to read about 25% higher and C2 to read about 12% higher flow.

What are the manufacturer's recommendations for equipment calibration?

Answer

​Our manufacturer's recommendation for calibration is as follows:

  • ​​Retrotec fans: Every 5 years.
  • DM-2 Mamometer: Every 2 years or if the Mamometer fails a field check.
  • DM32 / DM32 WiFi Mamometer: Every 5 years or if the Mamometer fails a field check.

Please review the DM32 and DM-2 Manuals on how to perform a field check.

This only covers our manufacturer recommendation. The energy standards (EN13829, ASTM, ATTMA, USACE, etc...) that you are using for test results may have different calibration intervals. Please consult the energy...

What is the flow range (in units of CFM) for the 5000/6000 fan's range configurations?

Answer

500 Flow Chart.

6000 flowchart

How do I know how many fans I need for a Blower Door or Enclosure Integrity Test?

Answer

We have created two tools to help you ​figure out how many fans you will need for your test.

To access them, click on the link below:

http://retrotec.com/support/software-downloads

Then, scoll down to the Tester Tools section and download either the Blower Door or Enclosure Integrity version of the Number of Fans Calculator .

Next, open the file in excel and "Enable Editing" when a security warning appears.

Fill in...