The Light Trap/Fan Housing (LTFH) comes in four different sizes 4'x4', 5'x5', 6'x6', 6'x7', and 7'x7'. It is constructed with durable PVC, stainless steel and EXPS foam materials. The housings use double-wall construction for strength and durability with foam insulation between the layers. The housing is pre-fabricated with pre-drilled holes for rapid assembly and easy installation. The light trap material is easily accessed for removal when the fan needs maintenance or cleaning. The enlarged light trap area minimizes airflow restrictions and various sizes are available to fit most any fan up to 25,000 cfm. If you are interested and would like to learn more contact us here.