An igniter for solid cooking fuels includes a heat chamber and a heat gun manifold. The lighting unit includes a bottom cover having a plurality of sidewalls, light emitting modules each including a board disposed on the bottom cover and a plurality of light emitting diodes mounted on the board, and a light-transmitting resin layer covering the bottom cover and the board. A slit-width-adjusting mask is proposed for manufacturing the curved reflective elements in one exposing step according to the present invention. The device has a second substrate with at least one or more deflection devices thereon coupled to the first substrate. The substantially flat portion has a first parent material and a reinforcing material made of long-fiber sheet, and the shaping portion has a second parent material and short fibers. The seal assembly comprises an area of a resilient material and a supporting structure.