Aprilaire 8100 Installation Instructions Manual page 7

MECHANICAl INSTAllATION
DUCTING
(CONTINUED)
RETURN: fROM lIVING SpACE TO ERV
• S tale air from the house should be exhausted from one exhaust grille centrally located, such as a hallway. For multi-floor homes, the exhaust
grille should be located on the same floor as the kitchen .
• T o keep the core free of grease, the ERV duct work must not be connected to a kitchen exhaust fan duct.
• T he ERV duct work should remain separate from bathroom exhaust fan ducts.
• 6 " round, galvanized duct work recommended. If rectangular
duct is used, it must have an equivalent air flow rating .
• A sound absorber at least 6 ft. long, consisting of 1" thick rigid
fiberglass duct or insulated flexible duct is recommended for
maximum absorbing of air movement sounds between the unit
and the living space return grille .
1 . Install a balancing damper in the duct near the ERV .
(See figure 15 .)
2 . Complete the Return ducting .
SUpply: fRESH AIR fROM ERV TO HOUSE
• I t is recommended that the supply duct be connected directly to
the HVAC return duct, a minimum of 10' from the HVAC blower .
• 6 " round, galvanized duct work is recommended.
1 . Install a balancing damper in the duct near the ERV .
(See figure 16 .)
2 . Complete the Supply ducting . Using a collar for the duct
connection to the HVAC return duct is recommended .
OUTDOOR: ExHAUST AND fRESH AIR CONNECTIONS
• I nsulated duct of at least R-4 insulating value with a continuous vapor barrier must be used for both duct runs connecting the ERV to the
outdoors . The vapor barrier must be sealed at both ends and extend from the ERV housing to the outer wall . (See figure 17 .)
fIGURE 17 – Ducting to Outdoors
STALE AIR
TO OUTSIDE
(CONTINUED)
fIGURE 15 – Damper in ERV Return
fIGURE 16 – Damper in ERV Supply
DAMPER
INSULATED DUCT
DAMPER
BUTTERFLY DAMPER
(IF ERV NOT RUNNING CONTINUOUSLY)
90-1747
DAMPER
90-1753
FRESH AIR
FROM OUTSIDE
90-1747
7