01. One chair, one consistent design The R seven twelve composting toilet chair uses one consistent Fusion design throughout this film. It brings automatic access, separated collection, enclosed mixing and planned weekly servicing into one system. 02. Approach and open An approaching person is detected by the front proximity sensor. The controller commands the top lid to open, and commands the separate solids shutter to open with it. Occupancy sensing keeps the chair open during use. 03. Front controls remain available The current Fusion front panel keeps both manual switches. Open and close commands provide backup when automatic detection fails. A close command must still respect occupancy and obstruction protection. 04. The shutter travels with the bin lid The shutter is now attached to the removable solids bin lid. Its motor, shaft, gate and seals travel with that lid, so the inlet can remain closed while the cassette is outside the chair. 05. Separate urine and solids The front bowl directs urine through its drain hose into the front vessel. The rear opening leads into the lined solids bin. Only clean water indicators and clean coconut coir are used in this demonstration. 06. A clear vertical drop path The revised stainless agitator is offset behind the opening. In the checked geometry, the vertical drop cylinder does not intersect the agitator. Falling material reaches the coir bed before the mixing cycle begins. 07. Leave, then close softly After the person stands and leaves, occupancy and obstruction checks permit a controlled, soft top lid closure. The controller also closes the solids shutter. Mixing is enabled only after both closed positions are confirmed. 08. A properly supported friction drive The rotation motor stays on the chair frame. Its mounting plate, pivot bushing, retained shoulder bolt, spring support and hanger stiffeners carry the reaction force. The rubber tyre presses against the outside of the bin. 09. The bin rotates; the agitator stays fixed The rubber tyre turns the heavy duty HDPE bin on its bearing. The lid and solid three sixteen stainless agitator stay still. A rigid insert protects the liner. External straps connect that insert to a split drive band below the bag fold, keeping mixing torque out of the plastic film. Material motion here is illustrative. 10. Three distinct sealing functions The flexible rim retains the bag. A separate rotary face seal closes the gap beneath the stationary lid. A replaceable shutter lip closes the drop mouth. Continuous extraction supports containment; actual leakage and odor performance still require testing. 11. Materials chosen for their jobs The frame has a fine textured powder coated finish. The urine vessel is light gray fluorinated high density polyethylene. The solids bin is gray, thick blow molded HDPE. The mixing crank, blades and internal bolts are specified as solid three sixteen marine grade stainless steel. Material and barrier performance require supplier confirmation. 12. Collect air from both headspaces Air is collected from the solids headspace beneath the closed shutter, and from a separate port in the urine container cap. The urine branch connects above the liquid level. Room air must be able to enter through a defined intake path. 13. Through the fan, filter and rear outlet The two branches join the suction duct. Air passes through the fan, then the sealed carbon filter housing, and exits low at the rear. The filter and discharge joints are on the pressure side, so their sealing matters as much as the suction connections. 14. Two inches, approximately five metres A nominal two inch internal diameter pipe carries the air approximately five metres outside the room. The outdoor termination needs a weather hood, insect protection and suitable location. Pipe slope and an accessible condensate collection point prevent liquid from returning to the chair. 15. Commission the real fan and duct together The supplied fan listing quotes thirty six cubic metres per hour, three hundred thirty pascals and six watts, but also states twelve volts at two amps. These figures do not establish the installed airflow. Commission the complete duct and filter before use. 16. Prepare for service Service frequency follows actual loading and container level. Enter service mode, close the top lid and shutter, and isolate the moving drives. Keep extraction running where the service procedure permits. Position a low support platform behind the cassette before extension. 17. Disconnect and slide out Remove the rear cover. Disconnect shutter power, release the home latch, and pull the suction union down clear of its spigot. Cap the cassette air port. Retract the rubber tyre. Withdraw the cassette four hundred fifty millimetres onto its support. 18. Lift the complete lid assembly Release the four captive lid fixings. Lift the cassette lid, closed shutter, motor and attached agitator together until the agitator clears the bin. Move the complete assembly onto a washable parking tray. The inlet remains with the lid. 19. Remove the protective insert Lift out the open bottom liner protection insert and its external drive straps. Its open bottom lets the contents remain in the bag. Park the insert on a washable tray. Check that the bag has not lifted with it. This added service step protects the flexible liner from the agitator during mixing. 20. Release the rim and remove the bag Peel off the flexible retaining rim. Gather the bag neck, lift the complete liner clear, and close it for the locally appropriate disposal route. Avoid squeezing or overfilling the bag. The film shows a clean service demonstration. 21. Fit the new liner and rim Inspect and clean the bin. Fit a compatible fresh liner, settle it fully inside, and fold the edge evenly over the rim. Refit the flexible retaining ring. Keep the outside fold above the drive band and away from the tyre and bearing. 22. Refit the guard and lid Lower the rigid insert inside the bag without trapping film. Seat its external straps onto the drive band ears. Refit the lid and attached agitator, then secure all four captive fixings. Check the rotary seal and shutter seal are clean and correctly seated. 23. Manual opening for coconut coir With power isolated, lift the clutch release sleeve to disengage the self locking worm drive. Use the manual lever to open the shutter. Add clean coconut coir to the marked starting level, approximately half the usable insert volume. Keep coir off the seal track. 24. Close, dock and verify Close the shutter manually and re engage the clutch. Slide the supported cassette home and engage its positive latch. Reconnect the air union and electrical connector, restore tyre contact, and confirm the home and closed position signals. Complete an empty functional check before automatic service. 25. Urine vessel service Check the urine level regularly. The current envelope is ten litres, so a full week depends on the number of users and their actual use. Disconnect and cap the drain and vent ports before removing the vessel. Empty, clean, inspect and reconnect it without blocking its headspace vent. 26. Exploded view from the front This exploded view separates the upholstery and shell from the metal frame, removable cassette, drive mechanism, urine vessel and ventilation assembly. The original chair geometry and the labelled development additions are kept consistent across the assembly views. 27. Exploded view from the rear From the rear, the service path, fixed traction motor and low exhaust module are visible. The cassette lid carries the shutter. The fan, filter and main frame remain on the chair. The outer cover lifts clear of the exhaust service notch. 28. Arms, legs and controller The padded arms allow side access, and the telescopic legs set the chair height using spring buttons. The controller coordinates the lid motors, shutter drive and bin drive. Continuous extraction has its own monitored supply and must not stop merely because the chair is unoccupied. 29. A design ready for prototype checks The revised CAD clears the sampled motion checks. Supplier interfaces, seal leakage, liner retention, mixing torque, airflow and protective controls still need physical verification. This film explains the intended design; it is not a claim of a tested working product.