Friction rate is a value located on a ductulator. We use it during the design phase of a duct system to predict the operating static pressure of a duct system. The challenge with friction rate is that it is often misapplied by folks using a rule of thumb (ROT). In order to apply friction rate properly, […]

First off, the correct acronym for a GFI (ground fault interrupter) is a GFCI (ground fault circuit interrupter). The purpose is to act as a safety device to protect from electrical shock. GFCIs can be built into outlets, circuit breakers, and even extension cords and are generally used for safety in wet environments like bathrooms, […]

First, a quick summary of the role of oil in the refrigerant circuit: The compressor requires oil for the lubrication of the moving parts in the compressor. If we could, we would keep 100% of the oil in the compressor, but since that is generally unrealistic, we need to utilize oils and oil strategies that […]