What Causes Facet Syndrome? Facet syndrome is generally the result of the natural aging process. However, the initial cause of arthritis, or facet syndrome, may also be an injury or overuse of the joints in youth. Another possible cause of facet disease is spondylolisthesis, which is when one vertebra â usually in the lumbar spine â slips forward over the lower vertebrae. When the facet joints become inflamed due to injury or age, the result is stiffness and pain.
An energy recovery ventilator (ERV) is a type of mechanical equipment that features a heat exchanger combined with a ventilation system for providing controlled ventilation into a building.
How much fresh air is required and the best way to provide it are important issues. Energy recovery from exhaust air is becoming common place in cold regions, and two types of equipment can do this- an HRV (Heat Recovery Ventilation) and an ERV (Energy Recovery Ventilation. Both HRVs and ERVs are somewhat new to mainstream home construction, and can often be confused.