Surface-mounted fans provide good ventilation for smaller areas. Large houses may need more than one.
Remote-mounted fans can pick up stale air from a single point. Or, they can be attached to a branched duct system with picks ups in two or three locations. This makes them a good choice for large houses. If properly rated, the fan could be attached to a range hood.
Large houses and several multifamily units can be ventilated by a single multiport fan. Some units can accept a duct from the range hood. Most operate at two or more speeds. Several manufacturers sell complete kits with all the ducts and accessories. These may cost a bit more, but the kits simplify installation.
This type of heat-recovery ventilator provides balanced air flow and recovers up to 85 percent of the heat from outgoing air. By warming the incoming air, AAHXs provide greater comfort in cold climates than other types of ventilation systems. Units can be sized for any home and small commercial buildings.
By employing a heat pump unit about the size of a window air conditioner, an exhaust air heat pump (EAHP) offers exceptional heat recovery efficiency. It can also provide most of the hot water needed by an average family. While the exhaust fan is controlled by timers, heat recovery engages only when hot water is needed.
Solar attic fans are a new group of products that use solar energy to move hot attic air. Attic exhaust fans remove hot air from attic spaces, while whole house fans remove hot air from both living spaces and the attic at the same time.
* Whole House Fan in Cathedral Ceiling
Whole house fans provide enormous air movement through out your home. Install one in a home with a cathedral ceiling. It can be done.
* Crawl Space Vents
Crawl spaces collect and condense water vapor. Crawl space ventilation is necessary to prevent mildew or rot. Vapor barriers may provide better protection than crawlspace vents.
* Roof Ventilation with Turbine Vents
Turbine vents can replace the hot air