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  Circular variable air flow regulators designed for low air velocities RVL-R
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  RPP-P air pressure VAV regulators
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  RPP-R air pressure VAV regulators
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  KCR-R Constant air volume flow regulator
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  RVP-P-EX flow regulators
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  VRRK constant air volume regulators
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  RVP-P – VAV regulators
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  RVP-R-EX flow regulators
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  RVP-R – VAV regulators
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  CAV Constant Air Volume flow regulator RCP-R