Whole-House Fan - Operable

Select sealants that:

are compatible with their intended surfaces,

allow for differential expansion and contraction between dissimilar materials,

meet the requirements of the applicable fire safety code (e.g. thermal or ignition barriers), and

for use inside the pressure boundary select low volatile organic compound (VOC) sealants that meet independent testing and verification protocols

Select materials that:

adequately support applied load and are permanent air barriers,

meet the requirements of the applicable fire safety code (e.g. thermal or ignition barriers), and

for use inside the pressure boundary select low volatile organic compound (VOC) materials that meet independent testing and verification protocols

Remove any material from the sealing area that will prevent full adhesion of the selected sealant

Construct a durable, rigid enclosure on all sides of the fan housing that is taller than the surrounding insulation

Install an operable cover for the fan enclosure that opens when the fan is operated and closes when the fan is turned off

Operable lid must have an airtight seal when closed

Insulate fan enclosure to a minimum of R-20

Install insulation in full contact with the enclosure

Mechanically fasten insulation to fan cover

Apply a continuous seal at all seams, cracks, joints, and edges of enclosure while applying sufficient pressure to push sealant into any gaps or cracks and contact any backing or infill material required

Provide an airtight seal for the enclosure cover when it is closed using weatherstripping, gaskets, or equivalent

Material integrity will meet a minimum expected service life of 20 years