Sheet Metal and HVAC Flashcards
6 cards from real Other Skilled Trades practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Sheet Metal and HVAC flashcards as text
What does HVAC stand for?
Answer: Heating, Ventilation, and Air Conditioning
HVAC stands for Heating, Ventilation, and Air Conditioning — the three core functions of building climate control systems.
What is the standard unit used to express the cooling capacity of an air conditioner in the US?
Answer: BTU per hour (BTU/h)
HVAC cooling capacity in the US is expressed in BTU per hour (BTU/h), where one 'ton' of cooling equals 12,000 BTU/h.
What type of duct system uses rectangular or square ducts fabricated from sheet metal?
Answer: Rectangular duct (flat oval) system
Rectangular duct systems use flat sheet metal panels formed into square or rectangular cross-sections, commonly used for main supply and return trunks in commercial HVAC.
What does SEER stand for in reference to air conditioning efficiency?
Answer: Seasonal Energy Efficiency Ratio
SEER (Seasonal Energy Efficiency Ratio) measures a cooling system's efficiency over a full cooling season by dividing total cooling output by total electrical energy input.
What is the purpose of a manual J load calculation in HVAC design?
Answer: To determine the correct heating and cooling equipment size for a building
Manual J is the ACCA standard calculation method used to determine the exact heating and cooling loads for a building, ensuring properly sized HVAC equipment is selected.
What refrigerant replaced R-22 (Freon) as the standard for residential air conditioning in the US?
Answer: R-410A
R-410A replaced R-22 as the standard residential AC refrigerant in the US after R-22 was phased out due to its ozone-depleting properties under the Montreal Protocol.