PM-4 (Power Module) is a 20 guage (1mm) galvanized steel junction box for use in under floor air systems.

The control transformer installed in the junction box is rated at 96VA 120/277VAC to 24VAC. It is rated for supply air temperature from 45–120°F (7–49°C). A molex connection provides power chaining to under floor devices; one (1) PAP-5 Plug & Play Cable is included.

The transformer includes a built-in circuit breaker (4-Amp) to protect the circuit from overloading. This reset button is located on the exterior of the transformer, accessible through an opening in the steel housing.

The PM-4 is approved for plenum use in UFAD application.