Thaw fish if frozen. Rinse fish; pat dry with paper towels.
Soak plank in enough water to cover for 1 hour.
In a small bowl combine maple syrup, shallot, chives, mustard, salt, and crushed red pepper. Brush mixture onto salmon.
For a gas or charcoal grill place plank on a grill rack of an uncovered grill directly over medium heat about 5 minutes or until plank begins to crackle and smoke. Place salmon on plank, skin side down. Cover and grill 12 to 15 minutes or until fish flakes when tested with a fork. Serve with fresh lemon wedges.
