PSUBS.ORG

PARTS LIST
1 - 2x6 plastic "project box" from Radio Shack
1 - 1.25 inch plastic pool hose coupler
1 - 1.25 inch plastic pool hose (any length)
1 - Antec Super Cyclone Dual Expansion Slot Fan
TOTAL COST: $20.00 (not including scrubber)

This is the back side of the fan/hose adapter made from a 2x6 inch plastic "project box" from Radio Shack. A 1 1/4 hole was cut into it with a hole saw, and one end of a 1 1/4 pool hose coupler was slipped through the hole. Approximately 1/4 inch extends beyond the cover on this side. I then used hot-melt glue to hold it in place. However, I used a bit too much glue and had to cut away the excess on each side so that the fan unit would fit properly.

Here is the front side of the fan/hose adapter. I used hot-melt glue on this side as well. The glue sticks great to these two materials and is extremely strong. The blue pool hose coupler (1.25 inch) comes about 6 inches long, so I just cut one end off of it. Note that the coupler end is tapered which makes assembly with the pool hose very easy.

Photo of the pool hose (1.25 inch) connected to the fan/hose adapter. The hose slips on easily but also has a tight seal. The hot-melt glue was more than strong enough to allow twisting, turning, and repeated connect/disconnect of the hose without fear of the coupling breaking off of the cover.

Here is the fan as it comes out of the box. You can see that it would normally take up two expansion slots in the back of the computer. The metal adapter is just a snap-fit and came off very easily.

This particular model has a switch that allows three speeds, 1500, 2000, and 2600 RPM. The airflow was rated at 20, 24.5, and 37.5 CFM. I decided to use the highest airflow rate after a very non-scientific test. I manually used the scrubber and used my hand to feel how much air pressure was coming out of it. I then tried to duplicate that feeling when using the fan. The highest speed felt like it was pretty close without being more than manual breathing.

Here's a look inside the unit at the squirrel cage. I simply tucked the speed-switch into the little pocket where you see the white wire.

Here's the fan attached to the pool hose via the fan/hose adapter. The two ends (lengthwise) could be trimmed and then the adapter hot-melt glued to the fan, but I didn't do that so I could take it apart again easily for inspection and taking these photos.

Here is the ExtendAir cartridge. This is a smaller size than the one they sent me two years ago, and I need to find out what model rebreather it is designed for. The length is exactly 7.75 inches.

Here is an edge view that clearly shows the channels for the air to move through. You'll note that because this cartridge is rolled, there is a seam on one side at about the 11 o'clock position. This would mean that some air could bypass the canister which is not good. Micropore deals with this issue by using gaskets in the end-caps of their canister (see photos below) to seal around the outside perimeter of the cartridge. The width of this cartridge is 3.875 inches.

The cartridge as it appears inside the canister. The length of the canister (not including the end-caps) and the cartridge are exactly the same at 7.75 inches. The little red button is a plug to prevent air going through the center of the cartridge.

Here is the end-cap. Both end-caps on the unit are exactly the same, so it doesn't matter which end you call the input and which you call the output. The big red gasket (not an o-ring) inside the end-cap makes contact with the perimeter of the cartridge to prevent air going around it. The end-caps come with hose adapters that look like quick connects for what-ever model rebreather it is designed for. Note the two small red o-rings.

Ok, so now we just connect the pool hose to one end of the canister. This was a tight fit and would need to be clamped properly in a real diving situation.

Here's a photo of the entire unit. Purchase a large enough hose for your particular sub and you've got an easily adapatable commercial grade scrubber for your sub. You could either leave the outlet as is, or run another hose from the outlet to a different section of the sub.

PARTS LIST 1 - 2x6 plastic "project box" from Radio Shack 1 - 1.25 inch plastic pool hose coupler 1 - 1.25 inch plastic pool hose (any length) 1 - Antec Super Cyclone Dual Expansion Slot Fan TOTAL COST: $20.00 (not including scrubber)
This is the back side of the fan/hose adapter made from a 2x6 inch plastic "project box" from Radio Shack. A 1 1/4 hole was cut into it with a hole saw, and one end of a 1 1/4 pool hose coupler was slipped through the hole. Approximately 1/4 inch extends beyond the cover on this side. I then used hot-melt glue to hold it in place. However, I used a bit too much glue and had to cut away the excess on each side so that the fan unit would fit properly.
Here is the front side of the fan/hose adapter. I used hot-melt glue on this side as well. The glue sticks great to these two materials and is extremely strong. The blue pool hose coupler (1.25 inch) comes about 6 inches long, so I just cut one end off of it. Note that the coupler end is tapered which makes assembly with the pool hose very easy.
Photo of the pool hose (1.25 inch) connected to the fan/hose adapter. The hose slips on easily but also has a tight seal. The hot-melt glue was more than strong enough to allow twisting, turning, and repeated connect/disconnect of the hose without fear of the coupling breaking off of the cover.
Here is the fan as it comes out of the box. You can see that it would normally take up two expansion slots in the back of the computer. The metal adapter is just a snap-fit and came off very easily.
This particular model has a switch that allows three speeds, 1500, 2000, and 2600 RPM. The airflow was rated at 20, 24.5, and 37.5 CFM. I decided to use the highest airflow rate after a very non-scientific test. I manually used the scrubber and used my hand to feel how much air pressure was coming out of it. I then tried to duplicate that feeling when using the fan. The highest speed felt like it was pretty close without being more than manual breathing.
Here's a look inside the unit at the squirrel cage. I simply tucked the speed-switch into the little pocket where you see the white wire.
Here's the fan attached to the pool hose via the fan/hose adapter. The two ends (lengthwise) could be trimmed and then the adapter hot-melt glued to the fan, but I didn't do that so I could take it apart again easily for inspection and taking these photos.
Here is the ExtendAir cartridge. This is a smaller size than the one they sent me two years ago, and I need to find out what model rebreather it is designed for. The length is exactly 7.75 inches.
Here is an edge view that clearly shows the channels for the air to move through. You'll note that because this cartridge is rolled, there is a seam on one side at about the 11 o'clock position. This would mean that some air could bypass the canister which is not good. Micropore deals with this issue by using gaskets in the end-caps of their canister (see photos below) to seal around the outside perimeter of the cartridge. The width of this cartridge is 3.875 inches.
The cartridge as it appears inside the canister. The length of the canister (not including the end-caps) and the cartridge are exactly the same at 7.75 inches. The little red button is a plug to prevent air going through the center of the cartridge.
Here is the end-cap. Both end-caps on the unit are exactly the same, so it doesn't matter which end you call the input and which you call the output. The big red gasket (not an o-ring) inside the end-cap makes contact with the perimeter of the cartridge to prevent air going around it. The end-caps come with hose adapters that look like quick connects for what-ever model rebreather it is designed for. Note the two small red o-rings.
Ok, so now we just connect the pool hose to one end of the canister. This was a tight fit and would need to be clamped properly in a real diving situation.
Here's a photo of the entire unit. Purchase a large enough hose for your particular sub and you've got an easily adapatable commercial grade scrubber for your sub. You could either leave the outlet as is, or run another hose from the outlet to a different section of the sub.