When ventilation hazards become active in an underground mine heading. it is very often necessary to evacuate the crew from the danger area. This evacuation is carried out along emergency escape (evacuation) routes to a heading which is not affected by a given incident. Such a heading must provide access to fresh air and guarantee that there is no smoke. https://www.markbroyard.com/hot-offer-greenery-gatefold-wedding-invitations-discount-mega-find/