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2002/04/16

...clean, draft free air is continually drawn into a person's breathing zoneEasy cleaning and draft free ventilation due to dual function operation (hopper and in-swing casement window).The simplest controlled ventilation system uses a quiet, high-quality surface-mounted fan. Fresh air enters through passive vents located in window sashes or outside walls. 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. If you want balanced operation, without the extra expense of heat recovery, these would be a good choice. Only one or two manufacturers make balanced ventilators without heat recovery. 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. That means ventilation sometimes occurs without heat recovery. The operating characteristics of an EAHP lead to greater air flow than required for a typical small house. Cold Barn, Naturally VentilatedWarm Barn, Naturally VentilatedWarm Barn, Fan VentilatedValid Air high performance air diffusers are designed to maximize room air circulation and provide a draft-free comfortable indoor environment. Advanced Framing Techniques - More Effective Insulation in Ceilings, Walls, and Floors - Draft-Free Construction - Energy-Efficient Appliances - High Quality Windows and Doors - Controlled Ventilation - Efficient Heating Systems Temporary Passive Ventilation - On the same wall, open upper or lower section of windows slightly to get temporary relief and prove to yourself that ventilation helpsCombined Active / Passive Ventilation - Add passive intakes to complement existing exhaust fans, heaters, stoves, fireplaces, etc. - * Duct heaters are now available to prevent cold draftsBalanced Active Ventilation - Balanced ventilation systems (with matched intakes and exhausts) do not upset combustion appliances. However, combustion and draft openings are still required for furnaces, water heaters, cooking stoves, fireplaces, etc. Heat Recovery Ventilation - NOTE : In some houses that employ combustion devices gas, oil or wood furnaces, water heaters, fireplaces, etc., a fresh air supply may be required to match the flows of exhaust-only ventilation systemFrequent Spillage From Combustion Appliances Can Be A Health Hazard - furnaces - water heaters - wood stoves - fireplaces - CMHC and others are studying ways to provide draft-free fresh air to match the flows of exhaust devices such as: kitchen range hoods - bathroom fans  - clothes dryers - whole house vacuum cleaners - fireplaces - wood stoves - whole house ventilators
posted by TT 7:28 AM

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