To start, choose HRV or ERV. As you complete each of the required fields, the next will be available as long as the entered value passes validation.

VENTILATION PERFORMANCE

CFM

ENERGY PERFORMANCE
Sensible Recovery Efficiency (SRE) %
 
@ 32 deg F / 0 deg C, low speed
@ 32 deg F / 0 deg C, high speed
Minimum SRE Requirement(%)
 
75%
68%
Installed Model SRE (%)
 
 
RETC Eligible
 
 
 
@ -13 deg F / -25 deg C, low speed - Not required for RETC in 2013
 
Power Consumed @ Low Fan Speed, watts
 
CFM @ Low Fan Speed
 
 
2013 Maximum EUI for RETC
 Installed Model EUI
Energy use index (EUI), watts per cfm
 
 
TIER DETERMINATION - BASED ON TECHNOLOGY (HRV or ERV)
Net Supply Air Flow
Energy Use Index (EUI), watts per cfm
Below 175 cfm
S
 <= 1.50 watts / cfm
1
Above 175 cfm
H
 < 0.75 watts / cfm
2
Tax Credit Calculation
TIER:

 

2013 RETC Credit: