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High Velocity |
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Many owners of older homes without forced-air HVAC systems, would like to
add central air conditioning and/or heating ducts, but are daunted by the
cost and difficulty of the installation process. Installation of ductwork
may require removing large sections of walls, floors or ceilings, or
adding unsightly box chases. However, high velocity heating and cooling
systems minimize these alterations by using small diameter ducts that can
be more easily threaded through floor, ceiling, and wall cavities.
According to the manufacturers, these high velocity systems operate
quietly and improve dehumidification, room air mixing, and energy
efficiency over standard air-delivery duct systems
High velocity heating and cooling systems use a special fan coil and air handling unit that generates high pressure air forced through small diameter ducts. The main supply trunk is either a rectangular or round duct that supplies air to flexible, insulated, 2" diameter plastic feeder ducts. Air passes through sound-suppressing tubing at the end of a duct run before entering the room through a plastic collar fitting. According to manufacturers, air is supplied at 440 to 1200 cubic feet per minute (CFM). High velocity systems use standard outdoor condensing units for air
conditioning and heat pump systems. As an option, a water coil can be
mounted in the air handling unit for boiler heating or chilled water
cooling. Alternatively, adding a bank of electric heating elements to the
air handler can provide heating capability to a high velocity
air-conditioning system. |
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