All Recessed Troffer FilterRetroFit Kits (6)Sort by NewestSort by Name (KCN) Cynergy Retrofit 1×4 (KCN) Cynergy Retrofit 2×2 (KCN) Cynergy Retrofit 2×4 (KVN) Ovation Retrofit 1×4 (KVN) Ovation Retrofit 2×2 (KVN) Ovation Retrofit 2×4