Autodoor

Autodoors are powered doors that open and close a lot faster than regular doors of the same material.

Acquisition

Autodoors can be be constructed with 25 Stuff (Metallic/Woody/Stony, 250 for SMVs), 40 Steel, 2 Components and 1,100 ticks (18.33 secs) after the autodoor technology has been researched.

Analysis

The autodoor draws 50 W of power at all times. If not enough power is available or the door brakes down, it behaves exactly like a regular door of the same material.

Contrarily to the in-game description, not all autodoors allow unimpeded movement. Actually, a powered autodoor opens at 400% speed. This means that all powered autodoors that are not made of stone indeed do not slow colonists down; walk speeds that would be high enough to have an effect in this case are not achievable in practice. Stone autodoors, however, open only slightly faster than regular wooden doors.

The below animation shows a comparison of different door types and materials (the animals all have the same movement speed of 5 c/s, comparable to a fast human pawn).

Opening speed of various doors. Door materials from top to bottom: stone (manual), no door, steel (auto), wood (auto), stone (auto), steel (manual), wood (manual)

Notes

Work to build an autodoor is 130% the value of the corresponding regular door.
Most other relevant stats (except opening/closing speed) are unchanged from regular doors of the same material.

Strategy

Steel autodoors offer the best compromise of durability and speed. Even unpowered they are only slightly slower than wooden doors, but a lot less flammable.
If fire immunity is required, a granite autodoor offers the highest durability of the stone doors (270 hit points). In practice, a Plasteel autodoor is probably the better choice (450 hit points, opens like a steel door when unpowered).
Due to the non-trivial power and materials cost, most bases want to use autodoors only in select locations.
Stone autodoors are risky to use, because in times of power failure they will slow down colonists tremendously. This is especially painful because a blackout situation is very often also an emergency situation, where free movement is important.
Since autodoors not only open, but also close fast, they help when a pawn needs to flee from a threat. This means that compared to the regular door, the auto door is more likely to close before the pursuer can step through or block the door.
Stone autodoors being only slightly faster than (regular) wooden doors means they are not practical in most situations, except when fire immunity is absolutely required, and a failing autodoor would not pose a problem.

Stats table

Autodoor	Beauty	Work to Build	HP	Flammability	Door Speed	Market Value
Material	Beauty	Work to Build	HP	Flammability	Door Speed	Market Value
Bioferrite	0	002,750 ticks (45.83 secs)	320	75%	400%	169
Gold	20	000,990 ticks (16.5 secs)	96	40%	400%	2,645
Granite blocks	0	006,740 ticks (1.87 mins)	272	0%	180%	187
Limestone blocks	0	006,740 ticks (1.87 mins)	248	0%	180%	187
Marble blocks	1	006,190 ticks (1.72 mins)	192	0%	180%	185
Plasteel	0	002,420 ticks (40.33 secs)	448	0%	400%	375
Sandstone blocks	0	005,640 ticks (1.57 mins)	224	0%	180%	183
Silver	6	001,100 ticks (18.33 secs)	112	40%	400%	395
Slate blocks	0	006,740 ticks (1.87 mins)	208	0%	180%	187
Steel	0	001,100 ticks (18.33 secs)	160	40%	400%	192
Jade	10	005,500 ticks (1.53 mins)	80	0%	400%	285
Uranium	0	002,090 ticks (34.83 secs)	400	0%	300%	295
Wood	0	000,770 ticks (12.83 secs)	104	100%	480%	173