Product: Whole-House Attic Fan Cover

Catalog Number: TD-AFC


R-40 insulation value!

Now available in some markets, a new
and improved design with many new benefits!

More information will be coming soon.

Contact us with any questions about the new design and its availability.

When used properly, a whole-house attic fan can be a very efficient way to keep your home comfortable in the heat of the summer, but during those times of the year when it is not being used, the "hole" in the ceiling can be a huge energy drain if not sealed properly.

The Therma-Dome Whole-House Attic Fan Cover is designed to air seal and insulate your attic fan opening. It provides greater comfort in the winter by blocking the escape of warm air into the attic. If air-conditioning is utilized during the summer, sealing off the fan opening during those months will help to keep hot attic air from infiltrating the living space of your home. This reduces the amount of energy required to keep your living area comfortable year-round.

The Therma-Dome is constructed of fire-rated polyisocyanurate foam insulation board sandwiched between layers of laminated foil, and is designed to last as long as your home.

The cover's sidewalls remain in place at all times, allowing for a full depth of insulation to be installed on the attic floor, right up to the edge of the attic fan. During the seasons when the attic fan is not in use, the lid is secured in place, with Velcro®* straps holding it tight against the continuous Q-Lon® cellular foam core gasket. This stops costly energy drain caused by airflow between the conditioned and unconditioned spaces of your home.

The Therma-Dome Whole-House Attic Fan Cover comes in an easily assembled kit, which includes six lap joint components, a tube of adhesive, foil tape, and step-by-step instructions. Equipped with only basic tools, you can assemble and install this money-saving fan cover in approximately fifteen minutes.

Each kit includes:

  • 6 lap-joint components
  • 1 tube of adhesive
  • 1 roll of foil tape
  • Step-by-step instructions

Please Note: The new R-40 Whole-House Attic Fan Cover is currently only stocked by a few distributors, and the R-20 version is only available by special order.

If you are a building materials, insulation, or weatherization supplies distributor that would
be interested in stocking this item, please contact Yankee to discuss the opportunity.

If you are interested in having one of these fan covers custom made, contact us and be sure to include the dimensions to which you would like to have the cover manufactured (width of the fan opening and height required for the lid to clear any fan equipment)