Masonry chimney venting, A warning – Sears N8MPL050B12B1 User Manual

N8MPL075B12B1, 8MPL050B12B1, N8MPN100J22B1, N8MPL125J20B1, 8MPL075F16B1, N8MPN100F14B1, N8MPL100J22B1, 8MPN125J20B1, N8MPN075F16B1, 8MPN075B12B1, N8MPN125J22B1, 8MPN100F14B1, 8MPN100F20B1, N8MPN125J20B1, N8MPL100F20B1, 8MPL075B12B1, 8MPL125J20B1, N8MPN050B12B1, 8MPN050B12B1, N8MPL125J22B1, 8MPN075F16B1, 8MPN150J20B1, 8MPN100J20B1, N8MPN075B12B1, N8MPL075F16B1, 8MPL100F20B1, N8MPN100F20B1, 8MPL100J20B1