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Current Category: Ventilation

Photo of the Month – February 2016

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"There's likely nasty exhaust fumes coming out of the vent, but it's OK since the economizer is probably inoperable anyway." Photo submitted by: Justin Bright, NCI Southern California Submit either your best or worst HVAC system photos to stevev @ ncihvac.com for...

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Mechanical Venting vs. Mechanical Combustion Air

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Mechanical combustion air is the only proven way to provide adequate combustion air to appliances under most field conditions. There are, however, certain cases where because of the size of a mechanical room, the amount of internal forces in a building or mechanical...

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Duct Leakage in Mechanical Rooms and CO

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Mechanical rooms housing heating equipment are required to maintain a neutral or slightly positive pressure to prevent combustion gasses from being pulled back down the flue into the room. The only appliances that this would not affect would be sealed combustion or...

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Draft Testing Done Right!

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Many of us have been taught that if draft in the flue is .02" W.C. or higher, everything is working fine. This is a very dangerous assumption because you don't have enough information to make an educated diagnosis. Remember, none of the above methods can differentiate...

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