Retrofitting

ASHRAE and other professional groups have published guidelines on the amount of air needed in different spaces. The quantities are generally provided in cubic feet per minute per occupant, or in air changes per hour. […]

Fan coil units are often used in apartments, hotels, offices, and classrooms. They provide efficient space conditioning of single zones with local control. A typical fan coil unit (FCU) has a single coil, a fan, […]

The benefit of circulating out the volume of air in a building over the unoccupied hours at night is more than just relieving the conditioned spaces of air high in carbon dioxide content and replacing […]

Many businesses store chemicals such as chlorine, acids, solvents, and strong cleansers that must be mechanically ventilated all the time. Usually, the entire storeroom is exhausted by a rooftop or wall- mounted fan. This fan […]

There are many roof penetrations in a complex building, for roof-mounted air-conditioning equipment and exhaust fans. These devices are usually installed on curbs which are sealed into the roofing material. With time the pitch hardens, […]