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Operation of any type of exhaust fans located in the-zone and the open or closed position of interior doors can affect the pressure in the furnace room. Since combustion appliances can come on at any time, you need to find out the most depressurized condition that can occur. , it is common to locate a gas- or oil-fired furnace and water heater in a basement that is essentially one big room. In these situations, a significant portion of the return ductwork is also located in this space. Return ducts often leak more than supply ducts, in part because builders are more likely to seal the supply ducts.

Keep ducts in the conditioned space as much as possible. Use the ACCA Manual D duct sizing procedure. Route ducts directly, especially if they have to be placed in unconditioned spaces. Use low-loss duct fittings; this permits smaller duct cross sections to be used. ) Locate registers near inside walls where feasible. L. Listed mastic. 12 9. 10. Insulate ducts in unconditioned spaces (R-8 preferred). Specify maximum 5% supply and return leakage to unconditioned spaces and require a test. Detailed design examples for conditioned-space ducts and a good-practice conventional duct system are carried out in the next volume in this series (Volume 4, Designing for Energy-Efficient Ducts).

Suspect isolation of zones as a culprit if, when the furnace-room pressure is at its most negative value, at least one room with supply register(s) but no return register has its door in the closed position. This can be tested by opening the door in question and seeing whether this relieves the pressure difference. 7 . System Fan and Exhaust Fans Together If depressurization only happens when both the system fan and the exhaust fans are on, a combination approach to a solution may be needed. Duct sealing alone may eliminate the condition.

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