Installation Instructions

The simplest, most effective, economical, and reliable way to introduce fresh air in homes with central forced air systems is to use the central fan to pull in and distribute a controlled amount of outside air. This central fan integrated supply ventilation approach depends on two control processes:

FAN CYCLING: Fan cycling assures that the central air handler fan will run enough to distribute ventilation air and evenly mix air throughout the house, even when there is no demand for heating or cooling. But rather than operate the fan continuously or by a simple timer, the FanCycler™ method factors in prior operation—it does not run the central fan for ventilation when operation for heating or cooling has already accomplished the necessary ventilation and mixing. In this way, the FanCycler™ method saves energy as well as wear and tear on equipment.

VENTILATION DAMPER CYCLING: Integrating a motorized ventilation damper with fan cycling limits over-ventilation during long heating or cooling cycles and saves the energy of unnecessarily conditioning this “extra” outside air. The damper opens when the fan is on unless enough time has already expired for the introduction of ventilation air.

Installation Diagrams

• Basement or Mechanical Closet Return

• Wall Return, Mechanical Closet

• Ceiling Return with Filter Grille, Gable-end Sidewall Intake

• Ceiling Return with Filter Grille, Drop-down Sidewall Intake

• Ceiling Return with Filter Grille, Extended Collar

• Ceiling Return with Media Filter at AHU

Other Help

• Q&A on Outside Air Flow Measurement

• Discussion of Outside Air Sources

• Guidance for Avoidance of Cool Air Complaints

• Central-Fan-Integrated Outside Air Flow Rate and Duct Sizing per 62.2

• Air Change and 62.2 Flow Rates

The Need | About | Products | Applications | Installation | FAQ | Articles | Links | Home