Double-glazed window or door assembly

1. A method of providing a double-glazed window or door assembly, the method comprising:

providing, in spaced relation to a first glass pane affixed to a frame, a second glass pane including two spaced apart pre-drilled holes, wherein the second glass pane is spaced apart from the first glass pane to form a volume there-between;

sealing, using a perimeter seal, a perimeter between adjacent or opposing faces of the first glass pane and the second glass pane to substantially seal said volume between the first and second glass panes;

mounting a one-way inlet valve in a first of the two spaced apart pre-drilled holes on the second glass pane to provide fluid communication from the atmosphere to the sealed volume between the first and second glass panes;

mounting, in a second of the two spaced apart pre-drilled holes, a one-way outlet valve on the second glass pane to provide fluid communication from the sealed volume to the atmosphere; and

introducing a substantially inert gas into the sealed volume between the first and second glass panes via the one-way inlet valve on the second glass pane to fill the sealed volume with the substantially inert gas while expelling air from the sealed volume via the one-way outlet valve on the second glass pane,

wherein the step of introducing the gas into the sealed volume comprises opening the one-way inlet valve via gas pressure against a resilient bias of the one-way inlet valve, and wherein the step of expelling air from the sealed volume comprises opening the one-way outlet valve,

wherein the step of opening the one-way outlet valve includes moving a valve member from a closed position, in which it prevents fluid communication from the sealed volume to the atmosphere, to an open position, in which it allows fluid communication from the sealed volume to the atmosphere,

wherein the step of expelling air from the sealed volume via the one-way outlet valve further includes turning a portion of the one-way outlet valve in a first direction to move the valve member from the closed position to the open position, and

wherein turning the portion in a direction opposite to the first direction enables the valve member to move from the open position to the closed position.

2. The method according to claim 1 , whereby the step of opening the one-way inlet valve includes:

moving a valve member from a closed position, in which it prevents fluid communication from the atmosphere to the sealed volume, to an open position, in which it allows fluid communication from the atmosphere to the sealed volume.

3. The method according to claim 2 , whereby the step of introducing the gas into the sealed volume comprises:

opening the one-way inlet valve by moving the valve member against a spring biasing the valve member to the closed position.

4. The method according to claim 1 , whereby the step of introducing the gas into the sealed volume between the first and second glass panes via the one-way inlet valve comprises:

connecting an external gas supply to the one-way inlet valve.

5. The method according to claim 1 , whereby the step of expelling air from the sealed volume via the one-way outlet valve further comprises:

collecting contents of the sealed volume.

6. The method according to claim 1 , wherein the one-way inlet valve and the one-way outlet valve are made from brass, stainless steel or an ultra-violet light stable material.

7. A method of providing a double-glazed window or door assembly, the method comprising:

providing, in spaced relation to a first glass pane, a second glass pane including two spaced apart pre-drilled holes, wherein the second glass pane is spaced apart from the first glass pane to form a volume there-between;

sealing a perimeter between adjacent or opposing faces of the first glass pane and the second glass pane to substantially seal said volume between the first and second glass panes;

mounting a one-way inlet valve in a first of the two spaced apart pre-drilled holes on the second glass pane to provide fluid communication from the atmosphere to the sealed volume between the first and second glass panes;

mounting in a second of the two spaced apart pre-drilled holes a one-way outlet valve on the second glass pane to provide fluid communication from the sealed volume to the atmosphere;

introducing carbon dioxide gas into the sealed volume between the first and second glass panes via the one-way inlet valve on the second glass pane to fill the sealed volume with the carbon dioxide gas while expelling air from the sealed volume via the one-way outlet valve on the second glass pane; wherein the step of introducing the gas into the sealed volume comprises: opening the one-way inlet valve via gas pressure against a resilient bias of the one-way inlet valve, and wherein the step of expelling air from the sealed volume comprises opening the one way outlet valve; and whereby the step of opening the one-way inlet valve includes: moving a valve member from a closed position, in which it prevents fluid communication from the atmosphere to the sealed volume, to an open position, in which it allows fluid communication from the atmosphere to the sealed volume.

8. The method according to claim 7 , whereby the step of opening the one-way outlet valve includes:

moving a valve member from a closed position, in which it prevents fluid communication from the sealed volume to atmosphere, to an open position, in which it allows fluid communication from the sealed volume to atmosphere.

9. The method according to claim 7 , whereby the step of introducing the gas into the sealed volume comprises:

opening the one-way inlet valve, by moving the valve member against a spring biasing the valve member to the closed position.

10. The method according to claim 7 , whereby the step of introducing the gas into the sealed volume between the first and second glass panes via one-way inlet valve comprises:

connecting an external gas supply to the one-way inlet valve.

11. The method according to claim 8 , whereby the step of expelling air from the sealed volume via the one-way outlet valve further includes:

turning a portion of the one-way outlet valve in a first direction to move the valve member from the closed position to the open position, wherein turning the portion in a direction opposite to the first direction enables the valve member to move from the open position to the closed position.

12. The method according to claim 7 , whereby the step of expelling air from the sealed volume via the one-way outlet valve further comprises:

collecting contents of the sealed volume.

13. The method according to claim 7 , wherein the one-way inlet valve and the one-way outlet valve are made from brass, stainless steel or an ultra-violet light stable material.