#279 Smoke Spec (does not include lenses) The #279 Smoke Spec insert fits most full-facepiece respirators. Click here for the Smoke Spec Insert Guide for examples of compatible masks. Click here for insert specs. Instruction Page. #279 Smoke Spec quantity Add to cart Category: Uncategorized Related products Anti-Fog Lens CoatingPer Pair – Free USPS First Class Shipping – (Smoke Spec lens orders only) $65.00 Add to cart Additional Anchor Bracket (does not include lenses) Add to cart