RELIEF
TYPE SMART DIFFUSERS
 Relief
type Smart Diffusers provide a viable alternative
to fan by-pass or system pressure control. Square Smart diffusers
are equipped with an inlet relief collar adapter and are included
as an integral part of all SCAH/SCVH units and are easily attached
by aligning slots with Smart diffuser collar legs then attaching
the two relief collar legs to outside of Smart diffuser collar
and install two screws. Discharge of supply
air, at full volume creates a slightly negative pressure in the
by-pass opening. The closure of the volume control plate
creates a positive pressure, allowing the excess supply air to
be redirected into the ceiling air space.
 The
primary design consideration
is to limit the maximum duct pressure, to approximately
the same pressure as
the downstream of a VAV box. Static pressure levels at .30”wg
develop N.C. levels which exceed
N.C .30 or a .20”wg control pressure
results in N.C .20 or less. The relief by-pass type units prevent
S.P. levels
from exceeding .20”wg
without the use of S.P.
controllers and dampers.
The application of relief
by-pass type units prevents
the Smart diffusers from
exceeding their catalogued
maximum N.C. volume  levels.
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