Energy-efficient homes -- both new and existing -- require mechanical ventilation to maintain indoor air quality. There are four basic mechanical whole-house ventilation systems -- exhaust, supply, balanced, and energy recovery. Comparison of Whole-House Ventilation Systems

Not sure if your attic space can handle a whole house fan? Here are the do's and don'ts when it comes to installing this type of ventilation system.

All whole-house ventilation requirements as determined by Section M1505.4 of the IRC 2018* or Section 403.8 of the International Mechanical Code (IMC) shall be met with a HRV system with minimum sensible heat recovery efficiency of 0.65.

Determine and design an appropriate type of ventilation. Select a whole-house ventilation system that complies with ASHRAE 62.2 if required to meet state code or to meet project objectives. Install and commission the ventilation system.

Whole-house ventilation entails using one or more fans and duct systems to exhaust stale air and/or supply fresh air into the house. Whole-house ventilation systems provide controlled, uniform ventilation throughout the house.

On April 1, 2021, the 2021 Oregon Residential Specialty Code (ORSC) became effective, introducing new requirements for continuously-operating, balanced mechanical whole-house ventilation (WHV) in Section R303.4 and revised other requirements.

When selecting the whole-house ventilation strategy that is best for your application, you should consider local code requirements, geographic location, special needs of occupants, and specific indoor and outdoor air-quality issues. Each of these three whole-house ventilation strategies can be designed for continuous or intermittent operation.

Mar 27, 2013 · A whole house fan brings outdoor air into your home which is measured in cubic feet per minute. As the air flows into your home, and through your attic – your roof vents allow the hot attic air to escape from your home.

Installing a whole house fan should be done by a professional. The installer should: Measure your attic space accurately. Install dedicated circuit wiring. Add additional attic vents if necessary. Proper attic ventilation is crucial.

The whole-house mechanical ventilation system can be designed to meet the ventilation requirements in one of several ways (DOE 2012): supply-only ventilation, exhaust-only ventilation, balanced ventilation with a heat recovery ventilator (HRV) or energy recovery ventilator (ERV), or intermittently balanced using a combination of timered exhaust ...