4.1006.3 Whole-House Fan

Topic: 
Attics
Subtopic: 
Attic Openings
For supporting material, see Building America Solution Center.
Desired Outcome: 
Consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between the conditioned space and unconditioned space to prescribed R-value of an adjoining insulated assemb
TitleSpecification(s)Objective(s)
4.1006.3a
Installation

Sides of fan insulation box assembly will be insulated to the same R-value as adjoining insulated assembly

Insulate to prescribed R-value

4.1006.3b
Air sealing

Fan insulation box frame will be continuously weatherstripped to ensure a tight fit

Fan insulation box will be constructed at a depth to protect the fan housing and motor from insulation

Prevent air leakage

4.1006.3c
Attachment

Non-compressible insulation will be permanently attached in contact with fan insulation box

Appropriate adhesive or mechanical fastener will be used

Ensure continuous alignment with air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary

4.1006.3d
Durability

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

Ensure a minimum expected service life

4.1006.3e
Occupant education

Purpose of insulation will be communicated to occupant

Educate occupant on how to use the whole-house fan to ensure integrity of the fan insulated assembly throughout service life