6.6003.6 Fan Placement (Whole House/Common Space Exhaust Only)

Topic: 
Exhaust
Subtopic: 
Fans
Desired Outcome: 
Provide primary ventilation for common spaces
TitleSpecification(s)Objective(s)
6.6003.6a
Clearance

Clearance for size of the fan recommended will be determined

Consideration will be given for adequate head clearance

Ensure access for installation, operation, and maintenance

Ensure occupant safety
6.6003.6b
Power source

Power source load will be determined as adequate

Consideration will be given to power source location

Provide accessible and adequate power source
6.6003.6c
Location

No resistance greater than 3 pascals will exist between fan intake location with reference to the common area

Allow fresh air distribution to common areas
6.6003.6d
Duct/vent

Consideration will be given to:

  • Vent termination location
  • Amount of space for duct run
  • Roof condition and type (e.g., metal, shingle, bow string, flat)
  • Duct insulation

When applicable, pitch duct to remove condensation to outdoors

Ducts will be as straight as possible, fully extended, and have the shortest run possible

To the extent possible, turns will be made so that the radius at the centerline is no less than one duct diameter

Duct diameter will be equal to or greater than the exhaust fan outlet

Fan flow will be verified by flow measurement to meet ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org standard 62.2

Effectively move the required volume of air
6.6003.6e
Attachment

Fan will be secured to a structural component

Structural integrity of the manufactured home will be maintained (e.g., roof trusses, walls, floor joists)

Maintain structural integrity

Maintain fan attachment
6.6003.6f
Total exhaust airflow

Total exhaust system airflow will be measured

Ensure exhaust airflow is as designed