Ventilator and method of manufacturing ventilator

A ventilator comprising:

• a body part with a box shape having a suction opening;
• an adapter plate with a flat plate shape that has a blowout opening and is provided on one surface of the body part;
• a blowing part that guides air to the blowout opening from the suction opening;
• and
• an adapter that is provided on the adapter plate to connect the blowout opening and an exhaust air duct,
• wherein
• the adapter includes:
• a connection surface connected to the adapter plate;
• and
• a cylindrical outer peripheral wall rising perpendicularly from the connection surface, wherein the connection surface and the outer peripheral wall are integrally formed of a metal material, and
• the adapter plate includes:
• a first hook part that is provided in an outer periphery of the blowout opening, corresponding to a side of the connection surface, is a first projection formed such that the adapter plate is partially cut and raised to have an L shape cross section and restricts the connection surface to slide in one direction, while restricting the connection surface to move in a direction away from the adapter plate in a restriction condition;
• a second hook part that is provided in the outer periphery of the blowout opening, corresponding to the side of the connection surface, is a second projection formed such that the adapter plate is partially cut and raised to have an L shape cross section and restricts the connection surface to slide in another direction intersecting with the one direction perpendicularly, while restricting the connection surface to move in the direction away from the adapter plate in the restriction condition;
• a first caulking joint part that is provided in a side located in the outer periphery of the blowout opening and facing the first hook part across the blowout opening, and joins the adapter plate and the connection surface in a state where the adapter plate and the connection surface are overlapped with each other;
• and
• a second caulking joint part that is provided in a side located in the outer periphery of the blowout opening and facing the second hook part across the blowout opening, and joins the adapter plate and the connection surface in the state where the adapter plate and the connection surface are overlapped with each other,
• wherein the first hook part restricts the connection surface to move in a direction away from the adapter plate when the connection surface is inserted under the first projection, and
• wherein the second hook part restricts the connection surface to move in the direction away from the adapter plate when the connection surface is inserted under the second projection.