Tei Explains It: Rater Class Distinction in Florida

Question: Is there a rater class distinction in Florida?

The answer is YES! Only in Florida are there 3 distinct classifications of energy raters – Class 3, Class 2 and Class 1.

Let’s review these three classification as well as requirements for each.

Class 3

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Class 3 ratings are ratings based on construction documents. A Class 3 Rater is only recognized in Florida and can only rate buildings from these construction documents alone. A Class 3 Rater is not recognized nationally by RESNET and can only perform ratings in the State of Florida.

A Class 3 Rater must obtain 12 CEU’s (Continuing Education Units) every three years. Currently these CEU’s do not have to be registered with the Florida Department of Business & Professional Regulation (DBPR) and allow the rater to get short trainings from suppliers of construction materials and processes as long as the courses are related to “green building”, construction materials, HVAC equipment, insulation, ventilation, IAQ and energy efficiency.

Class 2

Class 2 ratings are based on a site audit. A Class 2 Rater measures the windows, walls, floors, ceiling and doors. The equipment and systems in the home are documented by make and model number and all are documented by photographs which become essential if there is a problem. A Class 2 Rater, like the Class 3 Rater, is not recognized nationally by RESNET and can only perform ratings in the State of Florida.

A Class 2 Rater must obtain 12 CEU’s every three years similar to the Class 3 Rater. Currently these CEU’s do not have to be registered with DBPR and allow the rater to get short trainings from suppliers of construction materials and processes as long as the courses are related to “green building”, construction materials, HVAC equipment, insulation, ventilation, IAQ and energy efficiency.

Class 1

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Class 1 ratings are based on the site audit and include a building airtightness test as well as a duct leakage total test and duct leakage to outside test. A Class 1 Rater is the only one recognized nationally by RESNET and are allowed to perform ratings in every state except for California.

A Class 1 Rater can register the coveted tax credits for qualifying homes and are also eligible to register and certify homes for EPA’s Energy Star Version 3.0 (with special training) and DOE’s Challenge Home.

A Class 1 Rater is required to obtain 18 PDU’s (Professional Development Units) in three (3) years. These PDU’s can be obtained in three different ways.

  1. Attend a RESNET Conference and obtain 18 PDU’s by documentation of sessions to equal 18 hours. You can also attend the EEBA and ACI Conferences making sure that the tracks you attend are approved by RESNET
  2. Re-take the RESNET Core Exam and pass with at least 80%
  3. Take RESNET approved classes to obtain PDU’s

It is required that all raters regardless of classification will take a recertification test every three (3) years to retain their certification. At that time they will take a Recertification class and exams relevant to their classification. A Class 1 Rater will also show proficiency by performing a blower door and duct leakage test total and duct leakage test outside.

Questions regarding rater class distinction, contact Tei Kucharski.

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In The Field With Neil: Depressurize or Pressurize Airtightness Test

Question: Should the blower door test be performed in a pressurized or depressurized mode?

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The blower door test follows ASTM standard E779 (Standard Test Method for Determining Air Leakage Rate by Fan Pressurization), which states that this test method consists of mechanical pressurization or de-pressurization of a building and measurements of the resulting airflow rates at given indoor-outdoor static pressure differences. From the relationship between the airflow rates and pressure differences, the air leakage characteristics of a building envelope are determined. It is intended to quantify the air tightness of a building envelope and does not measure air change rate or air leakage.

So the answer is… either method is acceptable.

In general, we tend to depressurize buildings as it prevents a jet of air from being blown into the house during the test process. However, under certain conditions it is necessary to conduct a blower door test by pressurizing the building. For example, pressurization testing may be used to avoid the possibility of pulling known pollutants into the building during the test procedure (e.g. mold from wall cavities or crawlspaces). The pressurization test also requires an additional outside reference hose connected to the meter.

Remember it is fan sensor with reference to fan sensor location. Therefore if we are using a DG-700 meter, the fan sensor would be installed on the B-side input tap and the outside reference connected to the B-side reference tap.

Tip from Neil:
When reporting your results – we assume that a depressurization
test was done. If you tested otherwise, be sure to document it.

In comparing the results of a pressurization test to that of a depressurization test, in general the depressurization test will yield a slightly tighter structure. The reason is quite simple. A depressurization test tends to pull dampers closed (i.e. bath fans, kitchen fans and dryer vents), whereas the pressurization test will tend to force them open.

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