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Performance Data

Softaire® Diffusers are available in 4 different models:
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Product Models

Dimensions Table
  A B D A B C D A B C
6/8 1.5 17.0 6/8 1.5 16.0 23.75 6/8 1.5 17.0 11.5
10/12 2.2 23.75 10/12 2.2 22.75 23.75 10/12 2.2 23.75 15.7

High Entrainment Ceiling Air Diffusers

Softaire Diffusers are induction, or high entrainment, ceiling air diffusers for heating, ventilating, and air conditioning outlets that replace conventional grills. Our innovative design quickly mixes supply air with room air above the occupancy zone. Softaire completely mixes with room air in less than half the distance required by conventional diffusers. The mixture is uniformly distributed eliminating hot and cold spots. Softaire works well with variable air volume control, eliminating air dumping on low velocities.

Energy Efficient

By mixing supply air with room air in the short distance from the diffuser, the extreme delivery air temperature never strikes the walls or floors. Lower temperature differences at the walls and floor reduce heat transfer and thus energy loss. The total recirculation effect brings the room to temperature quickly, eliminating long lead times on start up. When outside temperatures are the most extreme, Softaire saves the most energy. Tests prove energy savings of 28%.

Quality Performance

Diffusers are made of high quality aluminum with a baked powder coat finish. There are no moving or adjustable parts. Simple install and feel the difference instantly!

  • System Resistance
    Softaire has unusually low pressure drop. Refer to first four lines of Performance Table for Velocity & Total Pressure (VP and TP).
  • The Throw
    in the Performance Table is the radial distance from the center of the diffuser to a point where the jet mixture slows to 50 FPM
Performance Table

NC Values:

Softaire Diffusers are very quiet. Sound pressure levels (SPL) never exceed ambient background SPL up through flow rates of 1,000 FPM. At 1,000 FPM the NC value of Softaire was 22. At 1,500 FPM the NC value was 33. These values are consistently quieter than the competitor's diffuser tested, which had NC values ranging from 23 at 600 FPM to 44 at 1,500 FPM.


Draw throws radius circles uniformly around the diffusers. For high air-change design, the throw patterns may show over-lap and wall interference. For low air-change, there may be space between patterns and walls. This is OK. Do not try to throw to the farthest corner of the room. The kinetic energy supplied by each jet will gently drive the air mixture to the farthest wall. The mixture will hug the ceiling because of the Bernouli velocity pressure effect and the zero relative weight of the air at the stabilization temperature.

Field Adjustment:

To find the design velocity of each diffuser, divide design CFM by the outlet area of the desired diffuser (see Performance Table). Read the average diffuser outlet air velocity with an appropriate air velocity meter. Do not use a volume instrument. Adjust the branch duct damper to obtain the design velocity.