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Tony HVAC/R Evacuation Quiz June 9, 2021, 10:25 pm
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Air changes per hour (ACH/ACPH) simply describes how many times the quantity of air in a room (or structure) is completely replaced per hour. If you have a 10'x10'x10′ room, the room contains 1000 cubic feet of air. If the supply and return to the room is supplying a balanced 100 CFM (cubic feet per […]
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DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source. When most people think about respiratory devices, their minds probably jump to soldiers wearing gas masks in warfare, hazardous waste […]
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The piston (fixed orifice) and TXV (thermostatic expansion valve) are the two most common metering devices in use today, with some modern systems utilizing an electronically-controlled metering device called an EEV (electronic expansion valve). It should be noted that there are other types of fixed orifice metering devices like capillary tubes, but their use is […]
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