Air King Ventilation Ashrae 62

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ASHRAE 62.2Ventialtion Solut ions

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Visit ASHRAE's web site toview or buy the ASHRAE 62.2Standard at www.ashrae.org

ASHRAE 62.2 is a minimum national standard that providesmethods for achieving acceptable indoor air quality in typicalresidences. The standard has three main components: WholeHouse Ventilation, Local Exhaust, and Source Control. Therecommendations that follow are for most common conditions,extreme conditions require additional consideration.

The exhaust fan dilutes the air in the main living spaces with outsideair to remove unavoidable contaminants from people, pets,cleaning, offgassing, etc. The whole house fan flow rate isdetermined based on the floor space and the number of bedrooms.The whole house fan provides multiple air exchanges within thehome each day. The operation can be continuous or intermittent(much higher airflow cycled by a timer) if less than 1 sone. Thechart below outlines the minimum ventilation requirements for continuous operation.

Continuous Ventilation

Ventilation Air Requirements, CFM

Floor Area Bedrooms

(ft2) 0-1 2-3 4-5 6-7 >7

7500 105 120 135 150 165

The key with a Whole House Exhaust Fan is quiet. In most cases

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the exhaust fan will be located in a central location of the home andwill run continuously, so you want it to be quiet. ASHRAE 62.2 callsfor continuously running exhaust fan to have a sound rating of lessthan 1.0 sones. Air King has engineered multiple products to meetand exceed the ASHRAE 62.2 standard, giving you a choice that

fits your ventilation need and your budget.

Whole House Continuous Ventilation ExhaustFan Options

ESB Series ESBH Series ESBG Series AKLS6 Series

AK150LS AKF Series AK Series BFQ50

BFQF50 FRAK Series

Local Exhaust removes high concentrations of contaminants in therooms where they occur (kitchens and bathrooms). The localexhaust fans can operate continuously at a lower flow rate (CFM),or intermittently (cycled by a switch or timer) at a higher flow rate if less than 1 sone. If operated continuously or on a timer the local

exhaust fan flow reduces the whole house exhaust fan flowrequirement. ASHRAE 62.2 Local Exhaust can be solved in threeways On Demand Local Exhaust, Continuous Local Exhaust, or Intermittent Local Exhaust.

ASHRAE 62.2 requires each room that creates contaminants(bathrooms, kitchens, art studios, etc.) must have some type of exhaust that clears the air to the outside of the home. For thisscenario a whole house continuous exhaust fan would be located ina central area of the home to meet the requirements for whole

house ventilation. In each of the rooms that create contaminants anexhaust fan (or range hood for the kitchen) would be utilized.

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Exhaust fans need to operate at less than 3.0 sones and typicallyutilize at least a 4" duct. Air King recommends this scenariobecause by locating the continuous exhaust in a central location of the home, it maximizes the effectiveness. By using separate localexhaust, it allows the room to be properly ventilated for size and

need (a bathroom with a steam shower is going to need more thana powder room). This arrangement is already understood by homeowners and installers and requires no new technology or training.

Air King has a multitude of fan solutions for local exhaust includingfan/light combination units, fire rated units and more. All Air KingENERGY STAR Qualified Exhaust Fans and ENERGY STARQualified Exhaust Fans with Lights meet these requirements.

In this option, the local exhaust fan is used to reduce the flow of thewhole house fan. The local exhaust fan would be located in the

bathroom instead of in a central location of the home and would beon a 24 hour timer switch that would cycle the fan on and off throughout the day. This involves a little more calculating. If the fanwill be on less than 35% of the time youll need to increase the flowrate 3 times (50=150). If the fan will be on 35-60% of the time youneed to increase the flow rate 2 times (50=100) and if the fan will beon 60-80% of the time you need to increase the flow rate 1.33times (50=67). As an example, if you need 50 CFM of continuouswhole house ventilation, you could use a 100 CFM fan for 12 hoursa day to obtain the required ventilation. These fans are required tooperate at less than 1 sone. A fan used in this manner will also need

an override switch to allow the occupant to turn the fan on or off when desired. Careful consideration should be given to the locationof the fan and the run time.

In this option, the local exhaust fan can provide some or all of thewhole house ventilation requirement. A continuously operating fanwould be located in the bathroom in addition to, or instead of, acentral location of the home. This would solve both the whole house(diluting the air in the living space) and local exhaust (removingcontaminants where they occur) requirement. Dual speed fans are aperfect solution for this application. A dual speed fan allows you toventilate at a low flow continuously and then jump to a boost speedwhen you occupy the room such as when the shower is running andadditional exhaust is needed to clear the room of steam andmoisture. Air King offers a wide range of fans that operate at thethreshold of hearing to provide ventilation without disturbing theoccupants.

Dual Speed Continuous Ventilation ExhaustFan Options

ESB Series ESBH Series ESBG Series AKF100D4

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AK100D FRAK100D

Many indoor air quality problems can be avoided by limiting theintroduction of items with the potential for creating problems suchas high VOC adhesives. Ventilation is not intended to overcome

obvious defects such as a leaky basement, proper repairs arerequired.

The standard requires either an outdoor vented rangehood (or microwave) sized for at least 100 cfm & less than 3 sones (all Air King ENERGY STAR Qualified Range Hoods are appropriate) or acontinuously operating kitchen exhaust fan sized for 5 air changesper hour. In a large kitchen this can be a lot of airflow so a ventedrangehood operated on demand by the user is a much better choice.

Air King recommends designers follow the prescriptive duct sizingrecommendations in ASHRAE 62.2. This results in lower energyusage due to low resistance to flow and strong likelihood thatinstalled performance will match design. Note that 3" ductwork isalmost never suitable by these recommendations. Air King hasintroduced several new products with larger diameter ductconnections (50 cfm 4" duct, 80 cfm 6" duct) to make complianceeasy.

For the best indoor air quality Air King recommends the wholehouse fan be located in a central location and operate continuouslyand, install On Demand local exhaust fans in each Bathroom and arange hood vented to the outdoors in the kitchen.

Many other details for proper design regarding solid fuelappliances, dryer exhaust, filters, air intakes, instructions for occupants, etc. can be found in section 6, refer to ASHRAE std62.2 for additional guidance www.ashrae.org .

NOTE: The recommendations made here cover the most commonsituations and in our opinion represent the best way to meet the

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intent of the standard, derive the greatest benefit and also balancecost, complexity, operational simplicity, ease of installation andother factors. The ASHRAE Standard provides many other possibilities as well as specific exceptions that might apply to your situation (extreme cold, extreme humidity, etc.). If you have reason

to suspect that your situation is outside the norm (steam sauna,indoor pool, high occupancy etc.) refer to ASHRAE 62.2 for additional information or consult a professional for help.Back to top

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