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2.3.2 CENTRAL DRAW POINT (CONNECTION TO A FORCED AIR SYSTEM)
2.3 HEPA 2000, HF 2.0, HEPA 3000, HF 3.0 AND HEPA 4000 UNIT
INSTALLATIONS (CONT’D)
A portion of stale air (coming from the register located in the highest level of the
house) is exhausted to the outside and the rest is drawn to the unit. Outside fresh
air is blended with interior air and then filtered. This filtered air is supplied to the
retur
n (plenum) of the forced air unit.
For this type of installation, it is not essential that the forced air system blower
runs when the unit is in operation, but we recommend it.
See figure below.
NOTE: Home with multiple forced air systems should have 1 unit on each system.
Do not connect the unit (HEPA 2000, HF2.0, HEPA 3000, HF 3.0 or HEPA 4000)
on any forced air system supply duct. Connect it only to the air return duct.
Do not install duct or duct connector directly above the forced air unit or
not less than 9’10’’ (3 m) of the plenum connection to the forced air unit, as
measured along the length of the duct.
2. TYPICAL INSTALLATIONS (CONT’D)
CAUTION