NCI Article Library

High-Performance HVAC Resources

Current Category: Ventilation

Dealing With Venting-Related Moisture Issues

Most technicians are familiar with the term Pre-Purge used to define the mechanical operation of a burner fan or draft fan prior to ignition of a burner. The main purpose of pre-purge is to operate the fan or blower to clear the combustion chamber or heat exchanger of...

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Combustion Air Diagnostics

According to NCI's Protocol, rising CO readings indicate combustion air or venting problems. In either case, flue gases are spilling into the space, requiring immediate attention. By measuring draft you can differentiate between venting and combustion air problems....

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Choose Your Venting Options Wisely

There are many applications in the field where conditions don't allow for conventional methods equipment venting, or when existing venting won't work. When you're faced with the decision to add venting assistance, you have two basic options: Draft Inducers, or...

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Capture Fall IAQ Opportunities

Fall and spring seasons lack the extreme temperatures that usually keep our services in high demand. You're required to dig down deep and focus on new ways to generate business. Let's take a look at several approaches you can use in your marketing and daily...

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Beyond the Venting Tables

There seems to be a lot of confusion about how to size a flue or chimney when multiple appliances are vented together in the field. Let's take a look at two flue sizing methods that you can choose to apply. The first utilizes the published industry venting tables. The...

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Barometric Damper Test and Installation

We've just released a new Barometric Damper Installation Procedure that will enable you to easily determine how to diagnose the need for, and install, barometric dampers under a variety of field conditions. Let's walk through a typical multiple vent scenario...

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