Displaying items by tag: ventilator

When exhaust fans are used to provide ventilation, both for industrial and process exhaust and personnel comfort, a negative air pressure is created within the building. This negative pressure causes several problems:  - Process exhaust systems are less efficient and may not work properly. - Down flow can occur through gravity vents and result in the back venting of products of combustionfrom flues and stacks of heaters and process equipment. - Drafts are created that