Specifications

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Ventilation
Ventilation Information
Definitions of Terms
Energy Recovery Ventilator (ERV)
An ERV transfer both heat and humidity. Use an ERV in humid
climates where air conditioning is used extensively. During the
cooling season this system will bring in fresh air cooling it down while
transferring the incoming humidity to the outgoing stream. During
thewintermonths,theERVwilltransferheatandhumiditytothe
incoming stream helping to keep the home environment comfortable.
Heat Recovery Ventilator (HRV)
An HRV transfers heat only from the outgoing air stream to the
incoming air stream while condensing moisture in the core which
is drained through a condensate tube. Use an HRV in the cold
Northeast,MidwestandalsointhedrySouthwest.
HVI
The Home Ventilating Institute (HVI) is an independent testing
organization that certifies various specifications and characteristics
of ventilation equipment. All of the ventilation equipment that EFI
carrieshasbeenHVIcertied.Formoreinformation,testresults
and definitions go to hvi.org.
Sone
A sone is a unit of measure for loudness. HVI uses sone measures
to compare noise levels for ventilation equipment. As a real world
comparison,1soneisapproximatelyequivalenttothesoundlevel
of a
quiet refrigerator in a quiet room. 3 sones is three times as
loud as 1 sone.
Themostcommon,inexpensivebathfansthatwehaveusedfor
decades are typically 5 to 7 sones. The quality fans that EFI sells
are often 1.5 sones or less.
There are no sone level ratings or comparisons for remote
mounted fans as a testing method has not been established to
compare the various installation variances.
Whole House Exhaust Fan
Exhaust ventilation systems work by depressurizing the home.
Balanced fan motors draw outside air into your home through
doors and windows while blowing indoor air up into the attic
whereitleavesthehousethroughridge,softorgablevents.
ASHRAE 62.2 Ventilation Guideline
ASHRAE(AmericanSocietyofHeating,RefrigerationandAir
Conditioning Engineers) is an organization that develops
standards for the HVAC industry.
62.2 is a standard that has been set for ventilation and indoor air
qualityforresidentiallow-risebuildings.Thisappliestosingle
familyhomesanduptothreestorymulti-familyhomes.62.2allows
forsupplysystems,exhaustsystemsandbalancedsystemsto
achieve the standard.
If you are being asked to comply with the ASHRAE 62.2 Standard
forventilation,itisimportantthatyoutalktoyourfavoritetraining
organization or work with organizations like the Home Performance
Coalition,BPIorRESNETtoreceiveguidance.Thesestandards
have changed over the years and it is important to get the latest
informationandtraining.Forinstance,oneofthemorerecent
innovations to the 62.2 standard is the allowance of some amount
of natural infiltration to be taken in to consideration when
calculating the necessary ventilation rate.
Go to ashrae.org for the most current information and more
specific detail.