6.6104.2a
Specifications will be field verified as appropriate to site conditions by installer
Forced air system will be appropriately sized to handle latent and sensible loads of dwelling unit with the addition of conditioned or unconditioned outside ventilation air
The manufacturer's temperature rise shall be maintained
Forced air system duct leakage will be less than 10% of the air handler design flow when measured at 25 pascals
Reduce migration of pollutants from unconditioned spaces
6.6104.2b
Wiring will be installed by a licensed contractor
Wiring will be installed in accordance with original equipment manufacturer specifications, and local and national electrical and mechanical codes
Refer to
NFPA
NFPA
National Fire Protection Association, www.nfpa.org
70: National Electrical Code for installation requirements.
Prevent an electrical hazard
6.6104.2c
Intake will be installed in accordance with all applicable code requirements and/or the most current version of
ASHRAE
ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org
62.2
Ensure occupant health and safety
Prevent entry of contaminants
Ensure unrestricted air flow
6.6104.2d
Outdoor air ventilation duct will be attached as close to the return side of the heating, ventilation, and air conditioning (
HVAC
HVAC
Heating, ventilation, and air conditioning
) system's circulating fan as possible while remaining in compliance with manufacturer temperature rise specifications
Filtration of ventilation air will be provided before reaching the
HVAC
HVAC
Heating, ventilation, and air conditioning
fan
Duct will be connected to intake fitting
Connection and seal will be performed in accordance with supply duct detail
Ensure short duct run to achieve optimum air flow
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
6.6104.2e
All duct components from outdoor intake to the air handler cabinet will be insulated to minimum R-8
Minimize energy loss
Prevent condensation
6.6104.2f
Motorized damper and
service switch
Service switch
An electrical switch that controls the complete flow of electricity to a mechanical device
will be accessible for maintenance
Ensure accessibility for maintenance
6.6104.2g
A motorized damper or equivalent technology will be installed between the outdoor air intake fitting and the return side of the air handler circulating fan
Outdoor air flow will be provided by scheduled operation of the damper or equivalent technology
Damper will be open only when the air handler fan is operating
Prevent air flow when none is desired
6.6104.2h
Outdoor air intake flow rates will be measured and documented to meet design requirements
Proper operation and calibration of controls and damper sequencing will be verified by installer
Ensure the performance of the ventilation system
Ensure occupant health and safety
6.6104.2i
Fire dampers must be accessible for inspection and/or testing by the local authorities; if fire dampers are not accessible from a grill or register, an access door in the ductwork is required
Sealing activities will not interfere with the operation of fire dampers, balancing dampers, or backdraft dampers
Type B fire dampers will be used as required by fire code
Ensure access to fire dampers for safe operation
Minimize static pressure
Maximize air flow
6.6104.2j
Occupant/property manager will be educated on the purpose of the system and how it works
Ensure the system is not unintentionally disabled
