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National Comfort Institute's Knowledge Base

National Comfort Institute's Knowledge Base is a collection of questions and answers to help NCI members and industry professionals. The knowledge base is open to both NCI members and NCI Online users.

Access Levels
Each question has an Access Level, NCI Member Only and NCI Online User. NCI Members can view all questions and answers in the knowledge base. NCI Online Users can read NCI Member Only questions but cannot access the answer. NCI Online users can only access NCI Online User level questions. Both NCI Members and NCI Online Users can ask knowledge base questions.

Asking a Question
Even though Knowledge Base questions are answered by both National Comfort Institute and trusted Industry Professionals, all questions and answers must be approved by National comfort Institute.


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Question Category: Air Balancing
NCI Member Only



Question Category: Air Balancing
NCI Member Only







Question Category: Air Balancing
NCI Member Only

Question: Do you have a fan table for .50" variable speed ? - To view, please click on the question.
Asked Date: 08/07/2007


Question Category: Air Balancing
NCI Member Only

Question: I had someone helping me balance a system. How can I tell if he did it right? - To view, please click on the question.
Asked Date: 04/12/2007




Question Category: Air Balancing
NCI Member Only





Question Category: Air Balancing
NCI Online User

Question: We need to have air flow hoods calibrated. What is the cost and where do we ship to?

- To view, please click on the question.
Asked Date: 11/15/2004


Question Category: Air Balancing
NCI Member Only

Question: When measuring a kitchen hood, should the cooking equipment be operating at temp or does it matter. - To view, please click on the question.
Asked Date: 11/08/2004






Question Category: Air Balancing
NCI Online User

Question: What type of manometer do you use when traversing a duct with a pitot tube. - To view, please click on the question.
Asked Date: 09/28/2004


Question Category: Air Balancing
NCI Member Only

Question: What do I do when an architect, engineer or building inspector doesn't accept my NBI certification? - To view, please click on the question.
Asked Date: 07/19/2004


Question Category: Air Balancing
NCI Member Only



Question Category: Air Balancing
NCI Member Only

Question: How do I create a AK factor? - To view, please click on the question.
Asked Date: 07/15/2004


Question Category: Air Balancing
NCI Online User

Question: If you can't get a flowhood on a grille can you measure CFM? - To view, please click on the question.
Asked Date: 07/15/2004


Question Category: Air Balancing
NCI Member Only

Question: In order to perform a duct traverse how many diameters of straight duct are needed? - To view, please click on the question.
Asked Date: 07/15/2004


Question Category: Air Balancing
NCI Member Only

Question: Why on a package unit do you measure static pressure in the supply plenum & return plenum? - To view, please click on the question.
Asked Date: 07/07/2004


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