An Aldes multiport fan lagged to concrete. Large flexible ducting completes the kitchen run; the smaller ones come from baths. The galvanized duct is the exhaust to outdoors. Such systems, which can exhaust several rooms, can also be suspended by wire in either attic or basement installations.
An Aldes multiport fan lagged to concrete. Large flexible ducting completes the kitchen run; the smaller ones come from baths. The galvanized duct is the exhaust to outdoors. Such systems, which can exhaust several rooms, can also be suspended by wire in either attic or basement installations.

Today’s builders, seeking to save energy, are building homes significantly tighter than those built 20 or even 10 years ago. This is admirable. But too often neither builder nor owner recognizes that these tight homes need controlled ventilation.

Historically, natural air leakage (infiltration) has ventilated our homes and controlled moisture levels, odors, and indoor air pollutants. The tradeoff has been that we’ve had to accept cold drafts and excessive heat loss. To get the best of both worlds, we need tight houses that have controlled ventilation systems, so that we, and not the...

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