Exhaust adapter

An exhaust adapter connected to a combustion device including a box-shaped device main body forming an outer shell and an exhaust cylinder protruding outward from the device main body, the exhaust adapter comprising:

• a box-shaped main body provided with an exhaust outlet that discharges combustion exhaust gas from the combustion device;
• an exhaust flow guide body provided in the main body and connecting the exhaust cylinder to the exhaust outlet;
• an exhaust flow path portion constituting a part of the exhaust flow guide body and including an opening that communicates with the exhaust outlet and a flange provided on an outer peripheral edge of the opening;
• a packing that is compressed and held between the flange of the exhaust flow path portion and an inner surface of the main body at an outer peripheral portion of the exhaust outlet;
• and
• a sliding guide portion provided on an inner surface of the main body and brought into pressure contact with an outer surface of a closing portion, the outer surface being an opposing wall of the opening in the exhaust flow path portion,
• wherein the sliding guide portion is formed with a concave arcuate portion inclined in a direction on a side of the exhaust outlet from a distal end side toward a proximal end side, and
• the exhaust flow path portion is fixed to the main body in a state where an outer surface of the closing portion is formed in a convex arcuate surface, and the convex arcuate surface is pushed in along the concave arcuate portion of the sliding guide portion.