Sand Trap Louver is used as Pre-filter for protection of Air Conditioning Plants; it has a High Degree of separation of Sand and large Dust particles.Standard Types of DVAC Sand Trap Louvers: – STL – STL-E – STL-DMRT – STL-DMFD – STL-DMRTF – STL-DMRTFDDVAC Sand Trap Louvers construction complies with BS EN 13181:2001 Standards. Catalogue