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An attic fan installed underneath a roof. A powered attic ventilator, or attic fan, is a ventilation fan that regulates the heat level of a building's attic by exhausting hot air. A thermostat is used to automatically turn the fan off and on, while sometimes a manual switch is used. An attic fan can be gable mounted or roof mounted. Additional ...
120– 240 V Multiple zones 1–2-stage cooling 1–3-stage heating Forced air Radiant Heat pump Oil Gas Electric Hybrid systems Humidistat 1st 1.10 Q4 2011 3.27" 1.76" Yes Yes No Yes No Yes 1-stage only 1–2-stage only Yes Yes Yes Yes Yes Yes No No 1st 1.12 Q1 2012 3.27" 1.76" Yes Yes No Yes No Yes 1-stage only 1–2-stage only Yes Yes Yes ...
The Mitsubishi model was the first air conditioner with a cross-flow fan. [64] [65] [66] In 1969, the first mini-split air conditioner was sold in the US. [67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by Daikin in ...
A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...
The Model N engine was produced by the Ford Motor Company. It first appeared in the Model N, which made its debut at the 1906 New York Auto Show in New York City, New York. The engine at first was a 2 cylinder with two spark plugs per cylinder. The valves had an L layout, meaning there was one valve per cylinder. By 1907, there was a 4 cylinder ...
A properly installed and located hygrostat should be used to monitor and control humidity levels automatically, or a well-informed and conscientious human operator must constantly check for correct humidity levels. A humidity below 50% can prevent water condensation on building materials. [1] A dehumidifier can be used to balance the humidity.
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