Just recently bought a pleasant hearth 1800 sq ft wood stove. The owners manual only gives heat shield clearances for combustible walls. My heat shield is 1” off the wall by metal studs, 1/2” concrete board then 30 gauge corrugated metal. My single wall flue is way past 18” from drywall. Any advice on my corner clearances from the corner of the stove to heat shield? Trying to hug my stove as close to the wall as I can.