| 6.6002.2a
Hole in building shell | A hole no greater than a 1/4" greater than the fitting will be cut to accommodate termination fitting | Allow for ease of weatherproofing |
| 6.6002.2b
Termination fitting | A termination fitting with an integrated collar will be used Collar will be at least the same diameter as the exhaust fan outlet; if collar is larger than exhaust fan outlet, a rigid metal transition will be used Fitting will be appropriate for regional weather conditions and installation location on house so as not to be rendered inoperable | Effectively move the required volume of air to the outside Preserve integrity of the building
envelope
Envelope
The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier
Ensure durable installation |
| 6.6002.2c
Duct to termination connection | Duct will be connected and sealed to 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
Fasteners will not inhibit damper operation | Effectively move the required volume of air to the outside Preserve integrity of the building
envelope
Envelope
The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier
Ensure durable installation |
| 6.6002.2d
Weatherproof installation | Exterior termination fitting will be flashed or weather sealed Water will be directed away from penetration Installation will not inhibit damper operation Manufacturer specifications will be followed | Preserve integrity of the building
envelope
Envelope
The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier
Ensure a weather tight and durable termination installation Ensure unrestricted air flow |
| 6.6002.2e
Pest exclusion | Screen material with no less than ¼" and no greater than ½" hole size in any direction will be used Installation will not inhibit damper operation or restrict air flow | Prevent pest entry Ensure proper air flow |
| 6.6002.2f
Termination location | Terminations will be ducted to the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors. Terminations will be installed: - A minimum of 3' away from any property line
- A minimum of 3' away from operable opening to houses
- A minimum of 10' away from mechanical intake
- As required by authority having jurisdiction
| Prevent exhaust from reentering house |
| 6.6002.2g
Kitchen exhaust | Galvanized steel, stainless steel, or copper will be used for termination fitting for kitchen exhaust | Prevent a fire hazard |
