Retractable flexible-panel door

A retractable, flexible-panel door mountable to a door frame attached to a building, comprising:

• a first side rail mountable to one side of the door frame,
• a second side rail mountable to an opposite side of the door frame,
• a top rail mountable to and between the first and second side rails along a top of the door frame, the top rail including first and second end caps and an elongated to rail member, the first end cap affixable to one end of the first side rail and defining a first terminal end, a first channel extending axially away from the first terminal end and a first notched portion positioned axially along the first channel and spaced apart from the first terminal end, the second end cap affixable to one end of the second side rail and defining a second terminal end, a second channel extending axially away from the second terminal end and a second notched portion positioned axially along the second channel and spaced apart from the second terminal end, the elongated top rail defining a first notched portion spaced apart from a first end thereof and a second notched portion spaced apart from a second end thereof opposite the first end of the elongated top rail, the first end of the top rail member received within and slidable along the first channel and the second end of the top rail member received within and slidable along the second channel, the top rail expandable between a minimum length in which the first notched portions of the first end cap and the top rail member respectively abut and the second notched portions of the second end cap and the top rail member respectively abut and a maximum length in which the first notched portion of the top rail member is positioned within the first channel adjacent to the first terminal end of the first end cap and the second notched portion of the to rail member is positioned within the second channel adjacent to the second terminal end of the second end cap,
• a bottom rail mountable to and between the first and second side rails along a bottom of the door frame, the bottom rail including third and fourth end caps and an elongated bottom rail member, the third end cap affixable to an opposite end of the first side rail and defining a third terminal end, a third channel extending axially away from the third terminal end and a third notched portion positioned axially along the third channel and spaced apart from the third terminal end, the fourth end cap affixable to an opposite end of the second side rail and defining a fourth terminal end, a fourth channel extending axially away from the fourth terminal end and a fourth notched portion positioned axially along the fourth channel and spaced apart from the fourth terminal end, the elongated bottom rail defining a third notched portion spaced apart from a first end thereof and a fourth notched portion spaced apart from a second end thereof opposite the first end of the elongated bottom rail, the first end of the bottom rail member received within and slidable along the third channel and the second end of the bottom rail member received within and slidable along the fourth channel, the bottom rail expandable from a minimum length in which the third notched portions of the third end cap and the bottom rail member respectively abut and the fourth notched portions of the fourth end cap and the bottom rail member respectively abut and a maximum length in which the third notched portion of the bottom rail member is positioned within the third channel adjacent to the third terminal end of the third end cap and the fourth notched portion of the bottom rail member is positioned within the fourth channel adjacent to the fourth terminal end of the fourth end cap,
• a handle coupled to and between the top and bottom rails,
• a flexible panel extending between the handle and one of the first and second side rails, and
• at least one biasing member carried by at least one of the first side rail, the second side rail, the top rail and the bottom rail to apply a force to the handle to draw the handle toward the one of the first and second side rails.