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American Aldes Controlling Stack Effect User Manual

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    Page 1 INTRODUCTION Central ventilation and toilet exhaust risers are designed for the purpose of providing mechanically controlled ventilation and protecting against poor indoor air quality. In high-rise buildings (buildings over four stories), exhaust ventilation risers and subsequent fans are often dramatically affected by environmental factors such as stack pressure. When buildings are built tightly to conserve energy, stack pressure has a greater effect on a system’s ability to regulate indoor air...
    Page 2 Example: A 200 ft. building in Chicago, 0°F winter design condition, 70°F indoor temp: ΔPs = .0000274 x 200 (70° F - 0°F) ΔPs = .00548 (70) ΔPs = 0.38 in. w.g. If the duct riser extends only partially throughout the building height, apply the same formula for only the length of the duct riser. To determine the stack pressure at each intake point, apply the same formula for the length of each point to the fan. This assumes that the fan at the top of the riser is capable of handling the increase...
    Page 3 and modulate the opening to regulate flow in response to these changes. This will allow the use of lower-pressure fans for energy savings and prevent stack pressure from effecting flow rates and resulting in over- and under-ventilation. Unfortunately, most modulating dampers on the market today are designed using pitot tube pressure-sensing devices and electric drive motors and controllers to actuate a damper for flow control. Using one of these devices on every intake point in a riser is often...
    Page 4 TYPICAL SPECIFICATIONModel CAR-II Constant Airflow Regulators by American ALDES Ventilation Corporation, Bradenton, Florida, shall solely operate on duct pressure and require no external power supply. Each regulator shall be pre-set and factory calibrated requiring no filed adjustment to the airflows as indicated on the schedule, and shall be rated for use in air temperatures ranging from -25°F to 140°F (-32°C to 60°C). Constant Airflow Regulators shall be capable of maintaining constant airflow...
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