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ECONOMIZER
HRV/ERV FRESH
AIR SUPPLY
HRV/ERV UNIT
STALE AIR
EXHAUST TO HRV/ERV
SUPPLY DUCT
RETURN AIR DUCT or
BREATHER T
FRESH AIR
SUPPLY
STALE AIR
EXHAUST
ROOFTOP
UNIT
B.D.
B.D.
Example only - Duct connections not typical
ROOFTOP
UNIT
HRV/ERV FRESH
AIR SUPPLY
SUPPLY DUCTWORK
CEILING RETURN AIR PLENUM
ROOF DECK
STALE AIR EXHAUST
HRV/ERV UNIT
ECONOMIZER
12" BREATHER
SPACE
B.D.
B.D.
FRESH AIR
SUPPLY
STALE AIR
EXHAUST
Example only - Duct connections not typical
Figure A
Figure B
The Integrated HVAC System