Round air flow controller for standard application in variable volume systems, suitable for supply and return.
Versions:
DDF-Q1 square design, one-way throw (usually standing against a wall)
DDF-Q2 square design, 2-way throw (usually set up in a corner)
DDF-Q3 square design, 3-way throw (usually standing against a wall)
DDF-Q4 square design, 4-way throw (usually set up freely in the room)
DDF-R2 round version, quarter round, 2-way throw (usually set up in a corner)
DDF-R3 round version, half round, 3-way throw (usually standing against a wall)
DDF-R4 round design, round, 4-way throw (usually set up freely in the room)
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