C20 (HVAC) Hvac systems Questions & 100% Verified Answers | Latest Update | Already Graded A+

Upflow Furnace: : Is used to describe furnaces that stand upright and blow air upward. These systems are designed for first floor installation with attic ductwork or basement installation with ductwork positioned below the first floor. Low boy furnace: : Similar to Upflow except the furnace is shorter so it can fit in basement with low ceilings. Down flow furnace: : Furnace goes into the attic and pushes air down through vents. Ductwork may be in a concrete slab floor or a crawl space under the house. Horizontal Furnace : Furnace is positioned on its side instead of vertically. These furnaces can be installed in crawl spaces, attics or basements. Multipurpose furnace 2 | P a g e : A furnace that can be configured for upflow, downflow, or horizontal installation. BTU (British Thermal Unit) : The unit of heat needed to raise one pound of water one degree Fahrenheit. The BTU is used to rate the capacity of heating and air-conditioning units. Air conditioning is measured in Tons of refrigeration (RT) A Ton of refrigeration is approximately 12,000 BTU/h thermal transmittance ( U value) : Measure how quickly heat-loss occurs through different materials. Example: Doors, insulation, windows ect. R-Value: : Measures resistance to heat flow so the higher the R-value the better it insulated a building. Calculating U-value: