Fin assembling method

A method for stacking a plurality of fins each having a plurality of fin slits for receiving a flat tube, the method comprising:

• arranging each of the plurality of fins at a fin stacking spot with openings of the plurality of fin slits facing downward,
• the arranging each of the plurality of fins including inserting a moving member into one or more of the plurality of fin slits and moving the plurality of fins to the fin stacking spot together with the moving member while keeping the plurality of fins in a downward orientation in which the openings of the plurality of fin slits face downward,
• the arranging each of the plurality of fins further including transferring the plurality of fins to a support arranged at the fin stacking spot such that the support is inserted into another one or more of the plurality of fin slits and supports the plurality of fins in the downward orientation, the other one or more of the plurality of fin slits being different from the one or more of the plurality of fin slits into which the moving member was inserted.