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.
Consumers should seek high recovery efficiency ratings from the independent Home Ventilating Institute (HVI). High-efficiency HRVs and ERVs should have HVI-rated of at least 76%. This level of efficiency is required to achieve an ENERGY STAR rating for homes with electric heat. The type of controls offered and the unit's energy efficiency compared to other models should also be considered when choosing a recovery ventilator.