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All units had rooftop-mounted air conditioner units which gave them their distinct "top hat" look. Norfolk Southern Railway (NS) was the sole operator of this model. [2] The company owned 125 units, numbered 8764–8888. [3]
Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space.
All were built with rooftop-mounted air conditioners which gives them a rather unusual and distinctive look - and were quickly coined "top hats" by the railfan community. Other than the standard cab, the model is identical in all specifications to the wide-nose "North American" safety cab Dash 9-40CW (or C40-9W) model (see below).
Mounted Window Air Conditioner Overall, LG's window A/C is a top choice for anyone looking to cool a space of up to 350 square feet . This one comes with a remote so you won’t have to get up ...
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
6 – Mixed (recirculated + outside) air duct A rooftop packaged unit or RTU. An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning system. [1] An air handler is usually a large metal box containing a blower, furnace or A/C elements ...