The FLX-PRV plenum box is installed into concrete screed for oval ventilation ducts. FLX-PRV box is fitted with 4 oval branch-off connections, two on each opposite side. The box is fitted with branch-off connections on different sides so that it can provide air to a larger number of anemostats. Both plenum boxes are used to supply and carry away air from an interior.
Flush mounted in the ceiling or under a layer of insulation, they are excellent for single-family houses and ventilation systems with heat recovery.