Fenestration unit with sash retention system

1. A fenestration unit, comprising:

a fenestration frame with a first frame member;

a sash including a sash frame configured to support a glazing unit;

a channel defined in the first frame member that extends along a first axis, the channel including a terminal end;

a retainer base associated with the sash frame that extends along the first axis; and

a retainer removably coupled to the first frame member and the sash frame to removably retain the sash frame on the fenestration frame, the retainer having a first retainer arm, a second retainer arm and a third retainer arm, the third retainer arm movably coupled to the channel and the first retainer arm movably coupled to the retainer base, the terminal end cooperating with the third retainer arm to enable the sash to move relative to a second axis while coupled to the fenestration frame.

2. The fenestration unit of claim 1 , wherein the retainer base defines opposed retainer channels, and the first retainer arm and the second retainer arm are coupled to a respective one of the opposed retainer channels.

3. The fenestration unit of claim 1 , wherein the third retainer arm defines a hook to engage with the terminal end of the wall.

4. The fenestration unit of claim 3 , wherein the terminal end of the wall of the channel includes a bulbous portion to engage with the hook of the third retainer arm.

5. The fenestration unit of claim 1 , wherein the third retainer arm is substantially planar.

6. The fenestration unit of claim 1 , wherein the fenestration unit includes a second frame member and a second sash frame, the second frame member includes a second channel that extends along the first axis, the second sash frame includes a second retainer base and a second retainer is removably coupled to the second frame member and the second sash frame to removably retain the second sash frame on the fenestration frame.

7. The fenestration unit of claim 1 , wherein the fenestration frame includes a head, a sill and a pair of jambs that interconnect the head to the sill, and the first frame member is coupled to the head of the fenestration frame.

8. The fenestration unit of claim 1 , further comprising a retention fastener configured to enable selective removal of the retainer from the channel and the retainer base to thereby release the sash from the fenestration frame, and the retention fastener is coupled to the retainer base to retain the retainer within the channel.

9. A fenestration unit, comprising:

a fenestration frame with a first frame member that defines a channel that extends along a first axis;

a sash having a sash frame including a retainer base that extends along the first axis, the retainer base defining opposed retainer channels;

a retainer removably coupled to the first frame member and the sash frame to removably retain the sash frame on the fenestration frame, the retainer having a first retainer arm, a second retainer arm and a third retainer arm, the third retainer arm movably coupled to the channel, and the first retainer arm and the second retainer arm movably coupled to a respective one of the opposed retainer channels of the retainer base; and

a retention fastener configured to enable selective removal of the retainer from the channel and the retainer base to thereby release the sash from the fenestration frame.

10. The fenestration unit of claim 9 , wherein the channel includes a wall having a terminal end that cooperates with the third retainer arm to enable the sash to move relative to a second axis while coupled to the fenestration frame.

11. The fenestration unit of claim 10 , wherein the third retainer arm defines a hook to engage with the terminal end of the wall.

12. The fenestration unit of claim 11 , wherein the terminal end of the wall of the channel includes a bulbous portion to engage with the hook of the third retainer arm.

13. The fenestration unit of claim 9 , wherein the fenestration frame includes a head, a sill and a pair of jambs that interconnect the head to the sill, and the first frame member is coupled to the head of the fenestration frame.

14. The fenestration unit of claim 9 , wherein the sash frame is coupled to the fenestration frame by the retainer and the sash is immovable relative to the fenestration frame.

15. The fenestration unit of claim 9 , wherein the sash frame is coupled to the fenestration frame by the retainer and the sash is movable relative to the fenestration frame.

16. A fenestration unit, comprising:

a fenestration frame with a first frame member;

a first sash including a first sash frame configured to support a glazing unit;

a first channel defined in one of the first frame member and the first sash frame that extends along a first axis;

a first retainer base associated with the other of the first frame member and the first sash frame that extends along the first axis;

a first retainer removably coupled to the first frame member and the first sash frame to removably retain the first sash frame on the fenestration frame, the first retainer having a first retainer arm, a second retainer arm and a third retainer arm, the third retainer arm movably coupled to the first channel and the first retainer arm movably coupled to the first retainer base;

a second frame member and a second sash frame, the second frame member including a second channel that extends along the first axis, the second sash frame including a second retainer base; and

a second retainer removably coupled to the second frame member and the second sash frame to removably retain the second sash frame on the fenestration frame.

17. The fenestration unit of claim 16 , wherein the first sash frame is coupled to the fenestration frame by the first retainer and the first sash is immovable relative to the fenestration frame.

18. The fenestration unit of claim 16 , wherein the first sash frame is coupled to the fenestration frame by the first retainer and the first sash is movable relative to the fenestration frame.

19. The fenestration unit of claim 16 , wherein the third retainer arm defines a hook, and wherein the first channel is defined by a bulbous portion to engage with the hook.

20. The fenestration unit of claim 16 , further comprising a retention fastener configured to enable selective removal of the first retainer from the first channel and the first retainer base to thereby release the first sash from the fenestration frame, and the retention fastener is coupled to the first retainer base to retain the first retainer within the first channel.