The USGBC stands for the United States Green Building Council which was founded in 1993 to promote sustainability in the building and construction industry. Their primary certification program is called .
Visible Light Transmittance (VLT) is generally expressed as a VT rating and measures just how much natural light comes in through a window. It is generally expressed as VT on the NFRC label as a number between 0 and 1 with the higher the number, the more visible light is allowed in. For More
VOC or Volatile Organic Compound are gasses emitted from certain solids & liquids (Think drying paint, new car smell, etc…)
Volatile Organic Compound (VOC’s) are gasses emitted from certain solids & liquids (Think drying paint, new car smell, etc…)
Voltage drop refers to the decrease in voltage caused by losses in the lines connecting the power source to the use point.
Visible Transmittance (VT) measures just how much natural light comes in through a window and is listed on the NFRC label. It is expressed as a number between 0 and 1 with the higher the VT rating, the more visible light is allowed in. (Also occasionally referred to as VLT or Visible Light Transmittance) For […]
A WRB or Weather Resistive Barrier is a barrier installed to help prevent water from migrating into the house when it gets past the initial exterior umbrella (i.e stucco, siding, brick, or…). The WRB’s secondary purpose is to also help prevent or limit air infiltration. For MORE
WRT or With Respect To is a term most commonly used for measuring pressure differences. For example, when preforming a duct test, we seal all the openings & pressurize the duct system to 25 pascals WRT to the house. For More
A zone is essentially a space or group of spaces which can be maintained with a single controlling device.For example; Your Air Conditioning might just have a single thermostat for the entire house (which would be considered one zone) or you might have multiple zones / thermostats for different areas in the house. While many […]
The Delta T or ΔT it simply an expression meaning difference in temperature. The most often used case is used for degree days & energy modeling and refers to the difference between the indoor & outside temperatures. In the infrared arena it can refer to the prior example or the difference between the ambient air […]