![]() ![]() HVI recommends that a whole-house comfort ventilator have a minimum capacity to provide approximately one complete air change every two minutes within the occupied area. Local codes may require different continuous ventilation rates – always check with your building officials to determine the specific requirements for your area. Such needs could occur as a result of larger gatherings of people smoking a hobby or activity using paint, glues or other air-quality contaminants or for any other reason that requires additional ventilation to improve the quality of indoor air. In addition to this minimum, continuous ventilation rate, HRVs and ERVs often have additional capacity to provide higher ventilation rates to meet the occupants' needs. This rate can be more easily calculated by allowing 5 CFM per 100 square feet of floor area. This calculation must consider the complete occupied volume of the house. For optimum kitchen air quality, always use kitchen range hoods, kitchen fans or downdraft kitchen exhausters that vent directly outside the home.įor continuous indoor air quality ventilation, a heat or energy recovery ventilator (HRV or ERV) should provide 0.35 air changes per hour. Note: Nonducted, recirculation kitchen range hoods provide no actual ventilation. Selecting range hoods with HVI-Certified Performance Ratings will ensure that ventilation expectations and building code requirements are met. Inflated performance ratings are common for range hoods that are not HVI-Certified.For "professional-style" cooktops, HVI recommends following the cooktop manufacturer's advice to determine ventilation requirements.For hoods located over islands multiply the rate by 1.5.Kitchen range hoods equipped with multiple speed settings allow low-level, quiet ventilation for light cooking with the ability for higher rates when needed. When considering a downdraft kitchen exhauster, consult the range manufacturer's recommendations. They are an alternative when canopy style hoods are not desired due to location of the cooking surface and kitchen aesthetics however, their performance cannot equal that of hoods that capture the rising column of air above the cooking surface. Downdraft kitchen exhausters require a higher volume and velocity of air to adequately capture contaminants. Kitchen range hoods mounted above the range capture contaminants with their canopy shapes and exhaust them effectively with relatively low air volume. Recommended kitchen range hood ventilation rates vary greatly depending on the type of cooking performed and the location of the range. For steam rooms, HVI recommends a separate fan located in the steam room that can be turned on after use to clear the heat and humidity.Ĭontinuous ventilation at a minimum rate of 20 CFM may be used in lieu of an intermittent 50 CFM exhaust fan.A timer or other control that ensures ventilation continues for a minimum of 20 minutes after each use of the bathroom should be installed in each bathroom.Bathroom doors need to have at least 3/4" clearance to the finished floor to allow proper entry of makeup air.Fans approved for installation in wet areas should be located over the shower or tub whenever possible. ![]() An enclosed toilet should have its own exhaust fan. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |