Stannah stair lift is good choice. Especially Stannah 320 outdoor stair lift has the standard safety devices, tested at full load for the equivalent of 10 years of use and the battery has long lasting, 3 up to 5 years.

The features of Stannah 320 outdoor stair lift are the following:
The batteries are always on charge. A tough cable constantly trickle-charges the batteries with 24 volts of power so that your stair lift is always ready to use. The battery charger is the only part of the stannah 320 outdoor stair lift that needs to be kept dry, so it is normally installed indoors or in a garage and is plugged into a standard outlet.
•Rugged protection from the weather. The seat is made from a plastic that doesn’t fade or crack in the sun, and the metal parts are doubles powder-coated to prevent rust.
•A swivel seat. At the top of the Stannah 320 outdoor stair lift can be swiveled to face onto the top landing, so that the back of the chairs blocks the stairs behind the user. This swivel uses really smooth roller-bearings to make the swivel easy to do.
•The best testing process in the industry. All Stannah stair lifts are tested at full load for the equivalent of 10 years of use, and the motor/gearbox is tested for the equivalent of 20 years.
The following technical specifications of Stannah 320 outdoor stair lift:
•Operating temperature range: 14ºF to 105ºF (-10ºC to 40ºC). Below 14ºF the chair may not lift the full weight, and the power cable becomes stiff and may not retract fully. The chair will work normally once the temperature returns above 14ºF.
•Minimum stair width: about 27″ (depends on knees of user, and local codes may apply)
•Weight limit: 300lbs.
•Depth of seat: 15″.
•Distance between armrests: 19″.
•Standard seat height from bottom landing: 21″.
•Standard seat height from top landing: 18″.
•Folded width from wall: 12.9″.
•Space needed at the bottom of stannah 320 outdoor stair lift: about 27″ in front of first step (but chair can be folded and sent up the stairs when not in use).
•Rail protrusion at bottom landing: about 15″.
•Rail protrusion at top landing: about 4″, but can be installed at 0″ if there is an obstruction at the top.
•Width of rail: 4″.
•Space taken by rail at side of stairs: typically about 7½”.
•Battery life (stair lift): typically 3-5 years.
•Speed: about 18′/minute (so about 45 seconds to ride up a typical staircase).
•Landing controls: hard-wired at top and bottom landing.
•Service interval: every six months is recommended.
•User maintenance required: none, but a wipe down with a damp cloth is OK for cleaning.

Standard safety devices of Stannah 320 outdoor stair lift:
-Seat belt: center-clasp across the lap.
-Over speed governor: only required in public buildings, but we fit one on all our stair lifts.
-Safety sensors: on the footrest and both sides of chair, to stop the stair lift if it touches an obstruction.
-Constant battery-charging: to prevent the biggest cause of breakdowns (flat batteries).
-Key lock: under one armrest and on both landing controls.

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