Tips
Open cell polyurethane foam baffles offer high end absorption coefficients, but are not class A fire rated. Their primary venues for treatment should be industrial plants and other non public locations. Hang them in a checkerboard pattern to avoid the "combing" effect where sound waves reflect through parallel sets of baffles without ever being intercepted. Also consider the VET Baffles as a possible alternative where you need moisture protection or a class A fire rated baffle.