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National Fuel Gas Code. O. Box 910 1, Quincy, MA 02269-9101. NFPA-211. O. Box 9 10 1, Quincy, MA 02269-g 10 1. THERMAL Appliances. National Fire COMFORT If a customer has a complaint of inadequate heating or cooling with a forced-air system, there is a good chance that the duct system is responsible. Sometimes the problem affects the whole house. In other cases it is confined to one or two rooms. Comfort problems caused by ductwork can be divided into two broad types: those that cause unsatisfactory heating, cooling, or dehumidification over the entire house, and those that only affect certain rooms.

This is still an attractive investment for most customers, but 2 years is even better. Note once again that, for many customers, the dollar savings will be merely thefiostifzg on tlte cake. Once they realize the thermal comfort, health and safety benefits of a good duct system, they may be willing to accept that there will be dollar savings and let it go at that. Other customers will want the numbers, so it will pay to be able to provide them. Once the duct repair decision was made, the efficiency of the new air conditioner needed to be selected.

These include square takeoffs from trunk to branch, hard 90” bends, abrupt transitions, and sagging or serpentine sections of flexible duct. Internal obstructions, such as closed dampers, should also be checked for. Example: a homeowner complained that a front bedroom was always cold in the winter. Inspection revealed that the house was divided into two zones by a damper system, and in order to include this bedroom in the sleeping zone the builder had installed two hard 90” bends with square elbows, one immediately after the other, in an attempt to get the air to make a 180” turn.

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