Per Gessle to achieve four U.S. #1's and two #2's, with their albums "Look Sharp!" and "Joyride" attaining platinum status in a number of countries. After Roxette's early nineties success, Per released a demo compilation album in 1992, "På väg, 1982–86". After the release of "Crash! Boom! Bang!" and subsequent world tour, Roxette took a break. In 1996, after a reunion and subsequent tour of Gyllene Tider, Gessle recorded his first English solo album, using Brainpool and Gyllene Tider as backing musicians. Christoffer Lundquist from Brainpool would also come to collaborate with Per on later releases. "The World According to Gessle", released
Air changes per hour the airflow efficiency of the enclosure and the methods used to ventilate it. The actual amount of air changed in a well mixed ventilation scenario will be 63.2% after 1 hour and 1 ACH. In order to achieve equilibrium pressure, the amount of air leaving the space and entering the space must be the same. formula_1 Where: Ventilation rates are often expressed as a volume rate per person (CFM per person, L/s per person). The conversion between air changes per hour and ventilation rate per person is as follows: formula_2 Where: Air change rates are often used as rules of