Installing the Nortek 1040746 VentilAire III Whole-House Fresh Air Supply System on a sloped roof requires careful attention to detail. Follow these steps for a safe and effective installation:
- Locate the Plastic Inlet Fitting: Identify the oval knockout on your furnace or air handler where the plastic inlet fitting will be installed.
- Install the Plastic Inlet Fitting: Securely attach the plastic inlet fitting to the sheet metal of your furnace or air handler. Position it no more than 2 inches from the return air inlet opening.
- Prepare the Roof Opening: Cut a 7 1/2-inch circular or square opening in the roof for the roof cap assembly. Ensure the opening is at least 3 feet away from any plumbing or exhaust vents.
- Route the Flexible Duct: Run the provided flexible duct from the roof opening down to the furnace area, through a hole in the ceiling. Attach one end of the duct to the bottom flange of the roof cap assembly.
- Secure the Roof Cap Assembly: Apply caulking or roof sealing material to the underside of the roof cap flashing to create a waterproof seal. Securely fasten the roof cap assembly to the roof using appropriate fasteners.
- Connect the Flexible Duct: Pull the slack in the flexible duct down through the ceiling hole to the inlet fitting. Trim any excess length and shape the end of the duct to fit over the collar on the inlet fitting. Attach it with the provided clamps.
- Moisture Control Recommendations: Adhere to the manufacturer's recommendations for managing moisture levels in your home. This includes using exhaust fans, venting fuel-burning appliances properly, and minimizing the use of humidifiers.
- Activate Whole-House Ventilation: Set the furnace control or thermostat control to WHOLE-HOUSE VENTILATION to activate the fresh air supply to your home. By carefully following these steps and consulting the detailed instructions in the Nortek 1040746 VentilAire III installation manual, you can ensure a successful installation.
