6.6003.2 Inline

Topic: 
Exhaust
Subtopic: 
Fans
Desired Outcome: 
Inline fans installed to specification
Note: 
The authority having jurisdiction may require that a licensed professional perform certain tasks outlined in this detail.
TitleSpecification(s)Objective(s)
6.6003.2a
Wiring

Wiring will be installed in accordance with original equipment manufacturer specifications and local and national electrical and mechanical codes

Prevent an electrical hazard

6.6003.2b
Access

Fan and service switch Service switch An electrical switch that controls the complete flow of electricity to a mechanical device will be accessible for maintenance according to NFPA NFPA National Fire Protection Association, www.nfpa.org 70 National Electric Code or local authority having jurisdiction

Fan and service switch Service switch An electrical switch that controls the complete flow of electricity to a mechanical device will be accessible for maintenance

6.6003.2c
Fan mounting

Fan outlet will be oriented toward the final termination location

Fan will be oriented so the equivalent length of the duct run is as short as possible

Fan will be mounted securely in accordance with manufacturer specifications

Fan will be isolated from the building framing unless specifically designed to be directly attached

Fan will be installed remotely by installing ducting from intake grille

Ensure short duct run to achieve optimum air flow

Ensure fan is installed securely

Ensure fan housing or building framing does not shake, rattle, or hum when operating

Minimize noise

6.6003.2d
Backdraft damper Backdraft damper A damper that allows air to flow in only one direction

A backdraft damper Backdraft damper A damper that allows air to flow in only one direction will be installed between the outlet side of the fan and the exterior

Prevent reverse air flow when the fan is off

6.6003.2e
Duct connections

Ducts will be connected and sealed to the intake fan and termination fitting as follows:

  • Round metal-to-metal or metal-to-PVC will be fastened with a minimum of three equally spaced screws
  • Other metal-to-metal or metal-to-PVC connections will be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus-embedded-fabric systems, or tapes
  • Flexible duct-to-metal or flexible duct-to-PVC will be fastened with tie bands using a tie band Tie band A strap, often made of nylon, that mechanically squeezes a flexible duct to a fitting. Must have a minimum performance temperature rating of 165° (per UL 181A-type test) and a minimum tensile strength rating of 50 pounds tensioning tool
  • PVC-to-PVC materials will be fastened with approved PVC cement
  • Other specialized duct fittings will be fastened in accordance with manufacturer specifications
  • In addition to mechanical fasteners, duct connections will be sealed with UL UL Underwriters Laboratories 181B or 181B-M listed material

Exhaust from desired location to outside

Preserve integrity of the duct system and building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

6.6003.2f
Boot to interior surface seal

Sealants will be compatible with their intended surfaces

Sealants will be continuous and meet fire barrier specifications

Prevent air leakage around intake housing

Prevent a fire hazard

6.6003.2g
Air flow

Air flows in CFM CFM Cubic feet per minute will be measured and adjusted to meet the design requirements

Exhaust sufficient air from desired locations to outside

6.6003.2h
Preventing air leakage caused by exhaust fans

Leakage to the house from other spaces will be prevented (e.g., garages, unconditioned crawl spaces, unconditioned attics)

Ensure occupant health and safety

6.6003.2i
Combustion safety

Pressure effects caused by fans will be assessed and corrected when found outside of combustion safety standards

Exhaust fans and other exhausting systems shall be provided with makeup air or other pressure relief

Ensure safe operation of combustion appliances

TitleSpecification(s)Objective(s)
6.6003.2a
Wiring

Wiring will be installed by a properly licensed contractor, as required by the authority having jurisdiction

Wiring will be installed in accordance with original equipment manufacturer specifications, and local and national electrical and mechanical codes

Prevent an electrical hazard

6.6003.2b
Access

Fan and service switch Service switch An electrical switch that controls the complete flow of electricity to a mechanical device will be accessible for maintenance according to NFPA NFPA National Fire Protection Association, www.nfpa.org 70 National Electric Code or local authority having jurisdiction

Fan and service switch Service switch An electrical switch that controls the complete flow of electricity to a mechanical device will be accessible for maintenance

6.6003.2c
Fan mounting

Fan outlet will be oriented toward the final termination location

Fan will be oriented so the equivalent length of the duct run is as short as possible

Fan will be mounted securely in accordance with manufacturer specifications

Fan will be isolated from the building framing unless specifically designed to be directly attached

Fan will be installed remotely by installing ducting from intake grille

Ensure short duct run to achieve optimum air flow

Ensure fan is installed securely

Ensure fan housing or building framing does not shake, rattle, or hum when operating

Minimize noise

6.6003.2d
Backdraft damper Backdraft damper A damper that allows air to flow in only one direction

A backdraft damper Backdraft damper A damper that allows air to flow in only one direction will be installed between the outlet side of the fan and the exterior

Prevent reverse air flow when the fan is off

6.6003.2e
Duct connections

Ducts will be connected and sealed to the intake fan and termination fitting as follows:

  • Round metal-to-metal or metal-to-PVC connections will be fastened with a minimum of three equally spaced screws
  • Other metal-to-metal or metal-to-PVC connections will be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus-embedded-fabric systems or tapes
  • Flexible duct-to-metal or flexible duct-to-PVC connections will be fastened with tie bands using a tie band Tie band A strap, often made of nylon, that mechanically squeezes a flexible duct to a fitting. Must have a minimum performance temperature rating of 165° (per UL 181A-type test) and a minimum tensile strength rating of 50 pounds tensioning tool
  • PVC-to-PVC connections will be fastened with approved PVC cement
  • Other specialized duct fittings will be fastened in accordance with manufacturer specifications
  • In addition to mechanical fasteners, duct connections will be sealed with UL UL Underwriters Laboratories 181B or 181B-M listed material

Exhaust from desired location to outside

Preserve integrity of the duct system and building envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

6.6003.2f
Boot to interior surface seal

Sealants will be compatible with their intended surfaces

Sealants will be continuous and meet fire barrier specifications

Prevent air leakage around intake housing

Prevent a fire hazard

6.6003.2g
Air flow

Air flows in CFM CFM Cubic feet per minute will be measured and adjusted to meet the design requirements

Exhaust sufficient air from desired locations to outside

6.6003.2h
Preventing air leakage caused by exhaust fans

Leakage to the house from other spaces will be prevented (e.g., garages, unconditioned crawl spaces, unconditioned attics)

Ensure occupant health and safety

6.6003.2i
Combustion safety

Pressure effects caused by fans will be assessed and corrected when found outside of combustion safety standards

Exhaust fans and other exhausting systems shall be provided with makeup air or other pressure relief

Ensure safe operation of combustion appliances