Field Reviews Privacy Policy

PRIVACY POLICY for FieldReviews

This privacy policy governs your use of the software application FieldReviews (“Application”) for mobile devices that was created by Michael Raiva . The Application is assisting in the consulting field reviews of construction projects.

User Provided Information

The Application obtains the information you provide when you download and register the Application. All other information about you are kept in the Application itself, and are not retrieved by us.

Automatically Collected Information

The Application may collect certain information automatically, including, but not limited to, the type of mobile device you use, your mobile devices unique device ID, statistical information like your origin, your region, and information about the way you use the Application. These data are solely collected as part of the scientific study, and will not be used elsewhere.

This Application does not collect precise information about the location of your mobile device.

We will not disclose any information with third parties, except where disclosure is required by law, such as to comply with a subpoena, or similar legal process.

Data Retention Policy, Managing Your Information

You can stop all collection of information by the Application easily by uninstalling the Application. You may use the standard uninstall processes as may be available as part of your mobile device or via the mobile application marketplace or network.

We will retain Automatically Collected Information as well as statistical relevant User Provided data for as long as you use the Application and for a reasonable time thereafter. We will not store your mobile phone number, or any other personal identifiable information.

Children

This Application is not for children. We do not collect any data from children.

Security

We are concerned about safeguarding the confidentiality of your information. We provide physical, electronic, and procedural safeguards to protect information we process and maintain. For example, we limit access to this information to authorised employees, contractors and scientists who need to know that information in order to operate, develop or improve our Application. Please be aware that, although we endeavor provide reasonable security for information we process and maintain, no security system can prevent all potential security breaches.

Changes

This Privacy Policy may be updated from time to time for any reason. We will notify you of any changes to our Privacy Policy by posting the new Privacy Policy on http://www.bouncingpebble.com/privacy  and through a link in your application. You are advised to consult this Privacy Policy regularly for any changes, as continued use is deemed approval of all changes.

Your Consent

By using the Application, you are consenting to our processing of your information as set forth in this Privacy Policy now and as amended by us. “Processing,” means using cookies on a computer/hand held device or using or touching information in any way, including, but not limited to, collecting, storing, deleting, using, combining and disclosing information, all of which activities will take place in Norway. If you reside outside of Norway, your information will be transferred, processed and stored there under the Norwegian privacy standards.

Contact us

If you have any questions regarding privacy while using the Application, or have questions about our practices, please contact us via email at customerservices@bouncingpebble.com

Ductulator Duct Sizing – common mistakes

I came across a good post on how a 6 inch duct will not always deliver 100cfm. The writer brings up a good point with regards to how to size ducts and in particular the careful and correct use of a ductulator.

In an ideal world, a duct sized at say 0.1 inches per 100 feet should give you 100cfm if the duct size is 6″. However, there is a big difference between a theoretical calculation that you can do on  a ductulator vs the real world application. The way the duct is applied has a lot to do with the delivered air flow. If its a residential application and the duct is a spiral that is laid down say in the attic, then there is great chance that kinks and other obstructions can impede the airflow reducing the airflow.

To make matters worse, most residential fans are typically fractional horsepower fans, meaning that their power or “oomph”  to deliver air does not react well to these obstructions. You end up having quite low airflows. In addition, the inability to measure airflows on small jobs makes it harder to tell how well the duct is performing.

So what is the best way to deal with this. A couple of things should help,

  1. When sizing your ducts on a ductulator, try using a lower friction rate to allow for bigger duct size.
  2. Keep in mind that when installing that the less obstructions you have on your duct the better you will be able to achieve your design airflow.

What’s a Ductulator?

A ductulator is a design tool that helps designers quickly size HVAC ducts without resorting to a calculator. Originally, duct sizing what based off either tables or charts. Over time as a need to improve productivity a ductulator was invented and is currently in wide use.

A ductulator is composed of four(4) sections: the air volume, velocity, rectangular dimensions, and round duct sections:

In addition, most ductulators also have both a metric and imperial side. The thing to note is that the placement of the  sections is different between the two sides and after regular use, most people are able to determine which units that they are working in.

A typical process to use the ductulator is to use the following process:

  1. Determine the amount of air you are moving, in either CFM or L/S
  2. Decide on the driver for your selection – either pressure drop usually given in in per 100ft or Pa or velocity(m/s or fpm)
    • There is a relationship between velocity/pressure drop and your duct size and energy use
    • Generally the higher the pressure drop, the smaller the duct size, but the higher the energy use.
    • Most designers design to 0.8″/100ft for small volumes and for high volumes, maintain the velocity between 1,800 fpm and 4,000 fpm.
  3. Once any combination of the two variables mentioned above is set, all other readings can be made.
  4. The round duct diameter or the rectangular ducts can now be read.

I hope the quick introduction to the ductulator allows you to get a high level view on how to use it. In other posts, I will get into more details on other intricacies on how to use this tool properly.

On the smartphone, there are many apps that offer the ability to use a ductulator on the go. One of them is Ductulator – Duct Sizer