ASHRAE 62.2 2007 requires homes have supplemental fresh air
ventilation. The number of bedrooms plus 1 = occupants. The number
of occupants X 7.5 CFM, plus 1% of the area. A 4 bedroom home with 1350
sq ft. would require (5 X 7.5 CFM)+ (1% of 1350) = 37.5 + 13.5 or 51
CFM. This is not supposed to include infiltration. The bathroom
& kitchen exhausts must also vent to the outdoors. I love runtime vents as a builder in a hot & humid
climate. Because it helps prevent negative pressure, air goes through the
filter & the coils and then is distributed through to the ducts. The
Builder’s Challenge program requires this ASHRAE 62.2 ventilation before
awarding the certification of Energy Smart with new homes. First healthy,
durable, and then energy efficient. Why don’t more Mechanical Engineers provide ACCA manual J
& D calcs. Sizing is so important in thermal comfort and efficiency. From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On
Behalf Of Edward G. Lyon Very tight houses often have problems
with indoor air quality and may have ACH .1 or less. General US practice
targets about .35 ACH as adequate for ventilation without any other provisions,
but you should consider your volume to occupancy ratio and recommended minimum
ventilation per occupant. This is a application that typically requires a
dedicated ventilation design. Ned Lyon, P.E. (MA) SIMPSON GUMPERTZ & HEGER From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On
Behalf Of ylinenergy
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